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Link Posted: 3/23/2021 2:50:14 PM EDT
[#1]
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Originally Posted By edwin907:


Anyone ever seen the box these fakes come in?
One of the few things I have religiously kept is the original scope boxes, Leupold, Nightforce, Aimpoint USO, and that was probably a good decision.
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Originally Posted By edwin907:
Originally Posted By ArmyPilot12:

If you don't trust the seller, call 1-800-Leupold and have them run the serial number.

COUNTERFEIT WARNING
Common counterfeit scopes purport to be Mark 4 riflescopes, VX-III riflescopes, Prismatic riflescopes, CQ/T riflescopes, LCO sights, and Deltapoint Pro sights. These counterfeits are regularly returned to us for service due to failures; however, counterfeit products are not manufactured by Leupold and are not covered by the Leupold Full Lifetime Guarantee. We do not provide service for counterfeit products.


Anyone ever seen the box these fakes come in?
One of the few things I have religiously kept is the original scope boxes, Leupold, Nightforce, Aimpoint USO, and that was probably a good decision.

I have never seen the boxes but I would think paper is easier to fake than metal.

I have seen a few fake Mk4s and, other than having the same serial numbers, you couldn't tell them from a real one externally. They were that good.
Link Posted: 3/23/2021 9:04:31 PM EDT
[#2]
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

Attachment Attached File
Link Posted: 3/23/2021 9:17:51 PM EDT
[Last Edit: cmdexe] [#3]
Does anyone know the Leupold P/N for the 5.56 SPR 77gr M3 elevation turret found on the VariX III/Mk4 3.5-10x40?

Attachment Attached File
Link Posted: 3/23/2021 9:18:41 PM EDT
[#4]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By teamjawbox:
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210323-200331_Photos_jpg-1877563.JPG
View Quote

Damn that looks good.
Link Posted: 3/23/2021 10:31:16 PM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By teamjawbox:
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210323-200331_Photos_jpg-1877563.JPG
View Quote


There's a guy selling reprint manuals over at Snipershide.  Don't know anything about them.  Just saw his ad the other day.
Link Posted: 3/23/2021 11:24:49 PM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Engineer5:


There's a guy selling reprint manuals over at Snipershide.  Don't know anything about them.  Just saw his ad the other day.
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Originally Posted By Engineer5:
Originally Posted By teamjawbox:
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210323-200331_Photos_jpg-1877563.JPG


There's a guy selling reprint manuals over at Snipershide.  Don't know anything about them.  Just saw his ad the other day.


Thanks, I pinged him about a week ago but no response.  His original post was a few months old so maybe he's out of them or done for now.  Figured I'd see if anyone had a lead on another source.  Much appreciated.
Link Posted: 3/23/2021 11:39:27 PM EDT
[Last Edit: tamboi] [#7]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JonnyMoses:
Does anyone know the Leupold P/N for the 5.56 SPR 77gr M3 elevation turret found on the VariX III/Mk4 3.5-10x40?

https://www.ar15.com/media/mediaFiles/265309/Screen_Shot_2021-03-23_at_6_18_02_PM_png-1877585.JPG
View Quote



I don't think one actually existed, early vari-x 3.5-10x40, had the 168 308 dial, ts30 ts30a2 a2 and mk4 3-9x36 had the 62 grain dial issued. I know someone posted a pic of a 77 grain m3 dial off I believe was a USMC rifle.  The 2.5-8 had 77 dials not sure whether they came that way or were unit purchases.

Attachment Attached File


Attachment Attached File


Attachment Attached File
Link Posted: 3/23/2021 11:50:37 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By teamjawbox:
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210323-200331_Photos_jpg-1877563.JPG
View Quote

Came together nicely. Is that a TAS stock adapter I see?
Link Posted: 3/24/2021 12:07:00 AM EDT
[Last Edit: cmdexe] [#9]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By tamboi:



I don't think one actually existed, early vari-x 3.5-10x40, had the 168 308 dial, ts30 ts30a2 a2 and mk4 3-9x36 had the 62 grain dial issued. I know someone posted a pic of a 77 grain m3 dial off I believe was a USMC rifle.  The 2.5-8 had 77 dials not sure whether they came that way or were unit purchases.

https://www.ar15.com/media/mediaFiles/28561/20210323_203015_jpg-1877762.JPG

https://www.ar15.com/media/mediaFiles/28561/Screenshot_20210323-202404_Chrome_jpg-1877765.JPG

https://www.ar15.com/media/mediaFiles/28561/20210323_203058_jpg-1877767.JPG
View Quote


I should've rephrased that. The pic I posted is off a 67950 which is a Leupold Mark 4 LR/T 3.5-10x40 Ilum TMR, however the calibrated turret should fit VariX III/Early Mk4 3.5-10x40 non illuminated, as they were both M3 elevation turrets.

So I guess what I meant to say is what is the part number for the 5.56 SPR 77gr. elevation turret for the 67950? Was hoping someone here had ordered one once upon a time, similar to how individuals had purchased the 112635 Mk12 Mod1 Mk262 turrets, but seems like Im going to have to call them tomorrow and get the run around.

Does anyone run a VariX III/Mk4 3.5-10x40 non Illum FFP Mildot on their Mk12? Would it be correct?


Link Posted: 3/24/2021 12:22:21 AM EDT
[#10]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By kmcale:

Came together nicely. Is that a TAS stock adapter I see?
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By kmcale:
Originally Posted By teamjawbox:
Anyone have a mod 0 manual they'd part with or anyone been thinking about printing a batch?

Pic for pic thread.and DStepec's beautiful sling.

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210323-200331_Photos_jpg-1877563.JPG

Came together nicely. Is that a TAS stock adapter I see?


Thanks!  Its getting closer but still got work to do.  That is indeed a TAS adapter thanks to Hunterex!(and Arms swan sleeve and OG uncle mike's front swivel he hooked me up with too).
Link Posted: 3/24/2021 12:25:47 AM EDT
[#11]
Another quick update on the bore guides...

First things first, the shop had an emergency job pop up for one of their big oil and gas customers so we had a brief delay. They're about done with all of the boring operations, and will be moving on to exterior profiling and cross drilling operations soon. We should see the machining done next week now instead of the end of this week.

On a more exciting note, I was able to get over and do testing and setup with the engraver on a few of the test samples that I've got. Took a few rounds of trial and error to get perfect but I'm really pleased with how well it turned out. We couldn't find an exact match for the font, so we wound up importing the reference image I had into their system and actually tracing it for a perfect match. The groove is about 5-10 thou deep and looks great. Still trying to determine whether we engrave then anodize or anodize then engrave, but either way, very pleased with the results.

First, here's the reference photo we were using...



Our first few attempts, size and font weren't quite right



Third time's a charm. This is after we drew the font from the original



Here's the complete results



And last just a big plug for the guys doing the work, Ident Markings in Rockwall, TX. Really great operation, they do all kinds of firearm engravings whether it's 80% builds or SBR markings. They have an FFL and can receive guns/parts for engraving. They do a ton of clone work including my Mk18 lower. If you need to have laser engraving done, give them a call.
Link Posted: 3/24/2021 12:28:53 AM EDT
[#12]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ringer706:
Another quick update on the bore guides...

First things first, the shop had an emergency job pop up for one of their big oil and gas customers so we had a brief delay. They're about done with all of the boring operations, and will be moving on to exterior profiling and cross drilling operations soon. We should see the machining done next week now instead of the end of this week.

On a more exciting note, I was able to get over and do testing and setup with the engraver on a few of the test samples that I've got. Took a few rounds of trial and error to get perfect but I'm really pleased with how well it turned out. We couldn't find an exact match for the font, so we wound up importing the reference image I had into their system and actually tracing it for a perfect match. The groove is about 5-10 thou deep and looks great. Still trying to determine whether we engrave then anodize or anodize then engrave, but either way, very pleased with the results.

First, here's the reference photo we were using...
https://imgur.com/dxGe6wJ.jpg


Our first few attempts, size and font weren't quite right
https://imgur.com/fjrSNhF.jpg


Third time's a charm. This is after we drew the font from the original
https://imgur.com/WGO2lZC.jpg


Here's the complete results
https://imgur.com/E0OGA4m.jpg


And last just a big plug for the guys doing the work, Ident Markings in Rockwall, TX. Really great operation, they do all kinds of firearm engravings whether it's 80% builds or SBR markings. They have an FFL and can receive guns/parts for engraving. They do a ton of clone work including my Mk18 lower. If you need to have laser engraving done, give them a call.
https://imgur.com/M0vPAd2.jpg
View Quote


Looks great!  Thanks again for taking on the project!
Link Posted: 3/24/2021 1:37:49 AM EDT
[Last Edit: cdholmes] [#13]
Anyone have a line on a quality 16" Ops Inc contour barrel that's available immediately?  Looking for Criterion chrome lined, but stainless is fine as well.  Putting together a Mod H.
Link Posted: 3/24/2021 6:11:50 AM EDT
[#14]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By cdholmes:
Anyone have a line on a quality 16" Ops Inc contour barrel that's available immediately?  Looking for Criterion chrome lined, but stainless is fine as well.  Putting together a Mod H.
View Quote


Likely bergera at pri
Link Posted: 3/24/2021 7:13:09 AM EDT
[#15]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By tamboi:



I don't think one actually existed, early vari-x 3.5-10x40, had the 168 308 dial, ts30 ts30a2 a2 and mk4 3-9x36 had the 62 grain dial issued. I know someone posted a pic of a 77 grain m3 dial off I believe was a USMC rifle.  The 2.5-8 had 77 dials not sure whether they came that way or were unit purchases.

https://www.ar15.com/media/mediaFiles/28561/20210323_203015_jpg-1877762.JPG

https://www.ar15.com/media/mediaFiles/28561/Screenshot_20210323-202404_Chrome_jpg-1877765.JPG

https://www.ar15.com/media/mediaFiles/28561/20210323_203058_jpg-1877767.JPG
View Quote


Not all, but the majority of the Vari-X's were the 62gr turrets like on the Ts30 and Ts30a2 as well.
Link Posted: 3/24/2021 9:20:31 AM EDT
[#16]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Hunterex:


Not all, but the majority of the Vari-X's were the 62gr turrets like on the Ts30 and Ts30a2 as well.
View Quote


Good to know, on a side note, need a 62 grain dial if anyone has one.
Link Posted: 3/24/2021 9:25:54 AM EDT
[Last Edit: Acetomco] [#17]
My vote on the bore guides is anodize first. Engrave second to get the raw aluminum/anodizing look in the numbers like the original. Your anodized/engraved lower has the correct look and was engraved after anodizing.
Link Posted: 3/24/2021 9:42:18 AM EDT
[#18]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ringer706:
Another quick update on the bore guides...

snip


And last just a big plug for the guys doing the work, Ident Markings in Rockwall, TX. Really great operation, they do all kinds of firearm engravings whether it's 80% builds or SBR markings. They have an FFL and can receive guns/parts for engraving. They do a ton of clone work including my Mk18 lower. If you need to have laser engraving done, give them a call.
https://imgur.com/M0vPAd2.jpg
View Quote

I have used Ident Marking a couple times for NFA stuff and they are outstanding to deal with and appreciate their customers.

Link Posted: 3/24/2021 11:50:14 AM EDT
[#19]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Acetomco:
My vote on the bore guides is anodize first. Engrave second to get the raw aluminum/anodizing look in the numbers like the original. Your anodized/engraved lower has the correct look and was engraved after anodizing.
View Quote


The issue we may run into with that is since we're deep engraving with the laser, we don't want to burn off any of the anodizing around the numbers as well.  If we engrave then anodize, the numbers would be black, but it's engraved deep enough that you can always grease/paint/chalk fill the numbers if you'd like.
Link Posted: 3/24/2021 12:03:13 PM EDT
[#20]
I missed the 4th and 5th pre-orders, but Int. Mil co opened up a 6th run, possibly final run of the GM or H&R A1 100% lowers. My GM is going to anodizing this week and I should have it early next month, purchased in December of 2020.

If anyone is looking to plan for the future and needs an A1 lower, get in before they are gone and AR's are banned. I guess that's not hyperbole now considering whats going on.

https://intlmilco.com/
Link Posted: 3/24/2021 12:45:55 PM EDT
[Last Edit: Acetomco] [#21]
The bore guides look great. Engraving before or after anodizing is fine with me. The bore guide will will not know the difference and do it's job. I am game though. You can pull my three and anodize first before engraving just to see how they turn out. I'm fine with a bit of burn around the numbers. If it happens and will still take them.
Link Posted: 3/24/2021 12:46:54 PM EDT
[#22]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JLAudio:
I missed the 4th and 5th pre-orders, but Int. Mil co opened up a 6th run, possibly final run of the GM or H&R A1 100% lowers. My GM is going to anodizing this week and I should have it early next month, purchased in December of 2020.

If anyone is looking to plan for the future and needs an A1 lower, get in before they are gone and AR's are banned. I guess that's not hyperbole now considering whats going on.

https://intlmilco.com/
View Quote

Hmmm..... the temptation has never been greater
Link Posted: 3/24/2021 1:58:03 PM EDT
[#23]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By kmcale:

Hmmm..... the temptation has never been greater
View Quote


I regretted missing out on previous runs, I want one of each. I pre-ordered the H&R today, the GM purchased last December is in process on either batch 2 or batch 3, can't remember exactly.

Link Posted: 3/24/2021 2:42:51 PM EDT
[#24]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By cdholmes:
Anyone have a line on a quality 16" Ops Inc contour barrel that's available immediately?  Looking for Criterion chrome lined, but stainless is fine as well.  Putting together a Mod H.
View Quote

Email sent.
Link Posted: 3/24/2021 2:54:53 PM EDT
[#25]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JLAudio:
I missed the 4th and 5th pre-orders, but Int. Mil co opened up a 6th run, possibly final run of the GM or H&R A1 100% lowers. My GM is going to anodizing this week and I should have it early next month, purchased in December of 2020.

If anyone is looking to plan for the future and needs an A1 lower, get in before they are gone and AR's are banned. I guess that's not hyperbole now considering whats going on.

https://intlmilco.com/
View Quote


Snagged a GM for my Mk12.  My block 2 build was getting close to surpassing the cost of my Mod 1, so had to get something to keep the Mk12 in the lead.

By the way, should legislation change the legal status of AR15's before this batch ships, Russian Paint will ship an 80% or refund your purchase.
Link Posted: 3/24/2021 9:58:05 PM EDT
[#26]
Looking for the unicorn of unicorns. If anyone has a ARMS #38 SPR PEQ 2-3 Top Rail please let me know. I’m looking for one for a true Mk12 Mod 0 build.

Any help would be extremely appreciated!!!
Link Posted: 3/26/2021 2:51:16 PM EDT
[Last Edit: jkacg1] [#27]
Anybody have a LEUPOLD MARK 4 TS-30 A2 3-9x36 or a 3.5-10x40 M3 Illuminated they want to sell?  About to pull the trigger on one, but seeing if one of you guys are moving one.
Link Posted: 3/26/2021 4:00:03 PM EDT
[Last Edit: flashooter] [#28]
Brownells is showing Badger MK12 gas blocks in stock as of today for those looking.
Edited to add Operation Parts now as well.
Link Posted: 3/27/2021 12:39:01 AM EDT
[Last Edit: cmdexe] [#29]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By jkacg1:
Anybody have a LEUPOLD MARK 4 TS-30 A2 3-9x36 or a 3.5-10x40 M3 Illuminated they want to sell?  About to pull the trigger on one, but seeing if one of you guys are moving one.
View Quote


If you're going for a Mod H, I have a Mk11 takeoff Vari-X/Mark 4 3.5-10x40 M3 non illuminated with Premier Reticles FFP Gen2 Mildot reticle. Have a 5.56mm SPR 77gr. M3 elevation turret for it on the way as well.
Link Posted: 3/27/2021 8:55:54 AM EDT
[#30]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JonnyMoses:


If you're going for a Mod H, I have a Mark 4 3.5-10x40 M3 non illuminated with Premier Reticles FFP Gen2 Mildot reticle. Have a 5.56mm SPR 77gr. M3 elevation turret for it on the way as well.
View Quote


Thanks, but this one is for a Mod 0.  

Link Posted: 3/27/2021 12:13:32 PM EDT
[#31]
After reading everything I could find via a Google search for this forum on replacement foam for the Pelican 1700 case. Is there a current source for replacement foam similar to what was used in the USGI issued cases?

My search and reading through the various pages in this thread said there was not a well liked current foam source for Mk12 Mod1 pattern foam with the proper cut outs. It appears I may just need to try my hand at cutting it out myself but I would like to start with the proper style foam. I started late in the game and missed the surplus Mk12 cases when they were more readily available.

Thanks in advance,
Ross
Link Posted: 3/27/2021 12:25:04 PM EDT
[#32]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By TW56:
After reading everything I could find via a Google search for this forum on replacement foam for the Pelican 1700 case. Is there a current source for replacement foam similar to what was used in the USGI issued cases?

My search and reading through the various pages in this thread said there was not a well liked current foam source for Mk12 Mod1 pattern foam with the proper cut outs. It appears I may just need to try my hand at cutting it out myself but I would like to start with the proper style foam. I started late in the game and missed the surplus Mk12 cases when they were more readily available.

Thanks in advance,
Ross
View Quote

You're best off looking for a milsurp, or cut your own. The only one I know of that sells mk12 cut foam is, iirc, cobra foam(?), and that is one that many have said to avoid. I've seen someone on other pages mention something about cutting his own on a cnc water jet type of deal, I do not know if this has happened though. @Hunterex may know the answer to that, as he is on the same CRA page I saw that on
Link Posted: 3/27/2021 12:46:04 PM EDT
[Last Edit: ArmyPilot12] [#33]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By TW56:
After reading everything I could find via a Google search for this forum on replacement foam for the Pelican 1700 case. Is there a current source for replacement foam similar to what was used in the USGI issued cases?

My search and reading through the various pages in this thread said there was not a well liked current foam source for Mk12 Mod1 pattern foam with the proper cut outs. It appears I may just need to try my hand at cutting it out myself but I would like to start with the proper style foam. I started late in the game and missed the surplus Mk12 cases when they were more readily available.

Thanks in advance,
Ross
View Quote

Try this post. It's years old and I don't know if the info is still valid. I almost went this route before I found my case.

https://www.ar15.com/forums/ar-15/Official-Mk12-Mod0-Mod1-ModH-Photo-and-Discussion-Thread/118-520524/?page=699#i7268065

ETA Just tried the supplied login/PW and they still work.
Link Posted: 3/27/2021 2:56:59 PM EDT
[Last Edit: nmxdavenn] [#34]
Mod h got its first piggy last night.



Link Posted: 3/27/2021 3:51:49 PM EDT
[#35]
Discussion ForumsJump to Quoted PostQuote History

Warms my heart.
Link Posted: 3/27/2021 6:06:40 PM EDT
[Last Edit: CPshooter1] [#36]
Hey y'all,

I finally found a real Mk12 take-off barrel and made some interesting observations.  Pictures are below.  I have some questions as well:

First and foremost, this is a Rev 3 barrel for the Mk12 Mod 1, but it has flats milled for the set screw type Mod 0 gas block.  Anyone know why or how this barrel ended up with milled flats AND dimples for the low-profile Mod 1 gas block set screws?  Anyone seen other Rev 3/Mod 1 barrels like this?  FYI - I also have a Rev 2 barrel that is the same way.

Moving on to picture #2 below, you can see a spacer that PRI included with their front sight/gas block assembly.  This is clearly there to align the set screws on the gas block with the milled flats and the rearmost dimple on the underside of the barrel that pulls the FSB down to seal around the gas port.  Without this spacer, the FSB makes contact with that rear step/shoulder and then the set screws and gas ports don't align properly.  

You can see in picture #3, the FSB makes contact with the OpsInc/Allen Engineering collar because of this spacer being there and there is not enough room for the FSB to fit in between the spacer and the collar.  I was warned that with a real Mk12 barrel, I would likely need to have the collar turned on a lathe to make it a bit shorter or else the collar would hit the FSB.  Now I understand why.

So here's why I'm trying to figure this out.  I am planning to send this barrel in to Compass Lake Engineering so they can reverse engineer it and make me a new barrel that is true to the original Mk12 spec.  I could be overlooking something obvious, but it seems to me that if they simply mill the flats, dimple, and gas port a bit further to the rear, everything would then align properly and I wouldn't need to use the spacer or modify the collar.  I don't imagine moving the gas port to the rear by ~1/16" will have any negative impact on the gas system...  Does that seem like a viable solution to the problem?  Why the hell didn't Crane, PRI, and OpsInc design everything properly to begin with?  In other words, who screwed up here?

*edit* It seems I overlooked the length of the gas tube and position of the gas tube roll pin!  This could be an issue as I'm not exactly sure what the consequence would be of having the gas tube further inside the gas key.  Perhaps it would be easier and less troublesome to move the step/shoulder for the collar forward a smidge and then increase the OAL of the barrel by that same amount so I'm not reducing the number of turns the suppressor will make on the brake?

Thanks in advance for any insights or suggestions you can provide!







Link Posted: 3/27/2021 6:52:06 PM EDT
[Last Edit: teamjawbox] [#37]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By CPshooter1:
Hey y'all,

I finally found a real Mk12 take-off barrel and made some interesting observations.  Pictures are below.  I have some questions as well:

First and foremost, this is a Rev 3 barrel for the Mk12 Mod 1, but it has flats milled for the set screw type Mod 0 gas block.  Anyone know why or how this barrel ended up with milled flats AND dimples for the low-profile Mod 1 gas block set screws?  Anyone seen other Rev 3/Mod 1 barrels like this?  FYI - I also have a Rev 2 barrel that is the same way.

Moving on to picture #2 below, you can see a spacer that PRI included with their front sight/gas block assembly.  This is clearly there to align the set screws on the gas block with the milled flats and the rearmost dimple on the underside of the barrel that pulls the FSB down to seal around the gas port.  Without this spacer, the FSB makes contact with that rear step/shoulder and then the set screws and gas ports don't align properly.  

You can see in picture #3, the FSB makes contact with the OpsInc/Allen Engineering collar because of this spacer being there and there is not enough room for the FSB to fit in between the spacer and the collar.  I was warned that with a real Mk12 barrel, I would likely need to have the collar turned on a lathe to make it a bit shorter or else the collar would hit the FSB.  Now I understand why.

So here's why I'm trying to figure this out.  I am planning to send this barrel in to Compass Lake Engineering so they can reverse engineer it and make me a new barrel that is true to the original Mk12 spec.  I could be overlooking something obvious, but it seems to me that if they simply mill the flats, dimple, and gas port a bit further to the rear, everything would then align properly and I wouldn't need to use the spacer or modify the collar.  I don't imagine moving the gas port to the rear by ~1/16" will have any negative impact on the gas system...  Does that seem like a viable solution to the problem?  Why the hell didn't Crane, PRI, and OpsInc design everything properly to begin with?  In other words, who screwed up here?

*edit* It seems I overlooked the length of the gas tube and position of the gas tube roll pin!  This could be an issue as I'm not exactly sure what the consequence would be of having the gas tube further inside the gas key.  Perhaps it would be easier and less troublesome to move the step/shoulder for the collar forward a smidge and then increase the OAL of the barrel by that same amount so I'm not reducing the number of turns the suppressor will make on the brake?

Thanks in advance for any insights or suggestions you can provide!

https://i.imgur.com/IT35Up9.jpg

https://i.imgur.com/Jg5Nxe6.jpg

https://i.imgur.com/38UXLFg.jpg

View Quote


an you stick a micrometer on the spacer and provide the dimension?  Curious if it's larger than the spacers PRI includes with current MK12 gas blocks.

Edit: I misread the post.
Link Posted: 3/27/2021 7:02:46 PM EDT
[Last Edit: KGLaw] [#38]
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Originally Posted By CPshooter1:
First and foremost, this is a Rev 3 barrel for the Mk12 Mod 1, but it has flats milled for the set screw type Mod 0 gas block.  Anyone know why or how this barrel ended up with milled flats AND dimples for the low-profile Mod 1 gas block set screws?  Anyone seen other Rev 3/Mod 1 barrels like this?  FYI - I also have a Rev 2 barrel that is the same way. They were a shared barrel between the Gen 3 and Mod 1s. After the Gen 3 ceased to exist, but the Mod 1s continued the flats were dropped.

Moving on to picture #2 below, you can see a spacer that PRI included with their front sight/gas block assembly.  This is clearly there to align the set screws on the gas block with the milled flats and the rearmost dimple on the underside of the barrel that pulls the FSB down to seal around the gas port.  Without this spacer, the FSB makes contact with that rear step/shoulder and then the set screws and gas ports don't align properly.

You can see in picture #3, the FSB makes contact with the OpsInc/Allen Engineering collar because of this spacer being there and there is not enough room for the FSB to fit in between the spacer and the collar.  I was warned that with a real Mk12 barrel, I would likely need to have the collar turned on a lathe to make it a bit shorter or else the collar would hit the FSB.  Now I understand why.  PRi sights from that era were made to sit deeper on the barrel. The gas port is drilled at the front of the leg, unlike later sights like yours where it's centered.  
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Originally Posted By CPshooter1:
First and foremost, this is a Rev 3 barrel for the Mk12 Mod 1, but it has flats milled for the set screw type Mod 0 gas block.  Anyone know why or how this barrel ended up with milled flats AND dimples for the low-profile Mod 1 gas block set screws?  Anyone seen other Rev 3/Mod 1 barrels like this?  FYI - I also have a Rev 2 barrel that is the same way. They were a shared barrel between the Gen 3 and Mod 1s. After the Gen 3 ceased to exist, but the Mod 1s continued the flats were dropped.

Moving on to picture #2 below, you can see a spacer that PRI included with their front sight/gas block assembly.  This is clearly there to align the set screws on the gas block with the milled flats and the rearmost dimple on the underside of the barrel that pulls the FSB down to seal around the gas port.  Without this spacer, the FSB makes contact with that rear step/shoulder and then the set screws and gas ports don't align properly.

You can see in picture #3, the FSB makes contact with the OpsInc/Allen Engineering collar because of this spacer being there and there is not enough room for the FSB to fit in between the spacer and the collar.  I was warned that with a real Mk12 barrel, I would likely need to have the collar turned on a lathe to make it a bit shorter or else the collar would hit the FSB.  Now I understand why.  PRi sights from that era were made to sit deeper on the barrel. The gas port is drilled at the front of the leg, unlike later sights like yours where it's centered.  


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04ish clamp sight over a takeoff Gen I sight.

Originally Posted By kmcale:

You're best off looking for a milsurp, or cut your own. The only one I know of that sells mk12 cut foam is, iirc, cobra foam(?), and that is one that many have said to avoid. I've seen someone on other pages mention something about cutting his own on a cnc water jet type of deal, I do not know if this has happened though. @Hunterex may know the answer to that, as he is on the same CRA page I saw that on


I haven't been keeping too up on the progress of that like I should. Friend of mine has an earlier example that the fellow on CRA cut and it looks pretty good.
Link Posted: 3/27/2021 7:56:10 PM EDT
[#39]
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Originally Posted By jkacg1:
Anybody have a LEUPOLD MARK 4 TS-30 A2 3-9x36 or a 3.5-10x40 M3 Illuminated they want to sell?  About to pull the trigger on one, but seeing if one of you guys are moving one.
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What did you end up doing with the one you found and was there multiple?  Not trying to steal your purchase but if you passed, I might move on it.  

Also starting the hunt for one today.  Would love any insight from anyone that might be able to track one down or sell.
Link Posted: 3/27/2021 9:41:46 PM EDT
[#40]
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Originally Posted By deadpunch:


What did you end up doing with the one you found and was there multiple?  Not trying to steal your purchase but if you passed, I might move on it.  

Also starting the hunt for one today.  Would love any insight from anyone that might be able to track one down or sell.
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I totally missed it.  I put an offer in on it and posted here.  When I went back to raise my offer, it was gone.
Link Posted: 3/28/2021 10:38:46 AM EDT
[#41]
Trying to stay away from ARMS rings. Were nightforce rings or unimounts ever used with the NF 2.5-10x24?
Link Posted: 3/28/2021 10:43:33 AM EDT
[#42]
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Originally Posted By Rothperson87:
Trying to stay away from ARMS rings. Were nightforce rings or unimounts ever used with the NF 2.5-10x24?
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I think I recall you doing a Holland? Idk about on the Holland, but on Mod 1 Ultralites for sure we're used
Link Posted: 3/28/2021 10:49:09 AM EDT
[#43]
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Originally Posted By kmcale:

I think I recall you doing a Holland? Idk about on the Holland, but on Mod 1 Ultralites for sure we're used
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Should’ve been more specific, doing a mod 1.

I want to use an A1 fixed stock but I can’t get enough eye relief with normal rings.
Link Posted: 3/28/2021 11:01:08 AM EDT
[Last Edit: kmcale] [#44]
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Originally Posted By Rothperson87:

Should’ve been more specific, doing a mod 1.

I want to use an A1 fixed stock but I can’t get enough eye relief with normal rings.
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Ended up using A110 for mine, and eye relief was great for me. You are taller than I though, so I can't say for certain it would be the same for you. I also admit to going the A110 route due to a scope I purchased that had them on from previous owner
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Link Posted: 3/28/2021 6:05:06 PM EDT
[#45]
Got the boys out today.  The PRI Douglas barrel on the Mod H build is an outright tack driver.  Not that the 1/7 on the Mod 0 isn't, I just think the Wylde barrel liked the 62gr ammo I was shooting better.  Very happy with both of these builds.

Praise the sun...

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Link Posted: 3/28/2021 7:45:56 PM EDT
[#46]
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Originally Posted By teamjawbox:
Got the boys out today.  The PRI Douglas barrel on the Mod H build is an outright tack driver.  Not that the 1/7 on the Mod 0 isn't, I just think the Wylde barrel liked the 62gr ammo I was shooting better.  Very happy with both of these builds.

Praise the sun...

https://www.ar15.com/media/mediaFiles/343681/SmartSelect_20210328-170349_Photos_jpg-1883968.JPG
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I got that reference
Link Posted: 3/28/2021 11:30:28 PM EDT
[Last Edit: deadpunch] [#47]
Welp, picked up a OG mod 0 with authenticity and all.  What the means is I'm going to put up on EE a listing of a PACKAGE deal of some of the things I'm willing to part with that I had in the works.  I don't want to deal with parting out all this and sending them all across the country to different places.  No idea what I'm going to ask yet mains because of the #32.  Honestly, will probably be a best offer deal for it all in one swoop.  But a sneak peak will be the following:

1. ARMS Wingless #38 spr-peq-2-3
2. GEN III PRI FF Handguard RAW
3. ARMS #40 wingless
4. PRI FSB (cross bolt)
5. ARMS #22 wingless high
6. ARMS #22 TRC w/rail

Sharing in here first because y'all have been very supportive.  If you're interested in a package deal and want to offer something then IM me and we can talk.  If you only email me about the #32, I'm going to assume you don't like money and are going to offer something crazy for it.  And because I know the first question will be "send pics of ARMS #32", I'll just show now.  The rest of the pics will be in the EE listing when it goes up.  

FWIW - I'm looking for a Knight's Armament M4 Match FF RAS, rifle length (now called the SR15/16 Match FF RAS) and/or a A1/A2 stock buffer and sprint kit, NightForce 2.5-10x24, if you wanted to package that in.

Again, please IM me if you're interested as my intent is not to lock of this thread but merely to let y'all know first I'm going to put some stuff up for sale before I actually put it on EE.

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Link Posted: 3/29/2021 11:15:18 AM EDT
[#48]
@ deadpunch,

That's a nice kit there!  I am curious if you happen to know when A.R.M.S. started putting the swan logo on the PEQ rail.  Also, I thought the early examples were supposed to have "wingless" swan logos vs. no swan logo at all.  Just curious which one is actually most "authentic" for a late Mod 0 build.

Thanks!
Link Posted: 3/29/2021 11:39:26 AM EDT
[Last Edit: teamjawbox] [#49]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By CPshooter1:
@ deadpunch,

That's a nice kit there!  I am curious if you happen to know when A.R.M.S. started putting the swan logo on the PEQ rail.  Also, I thought the early examples were supposed to have "wingless" swan logos vs. no swan logo at all.  Just curious which one is actually most "authentic" for a late Mod 0 build.

Thanks!
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Deployed/issued late Mod 0.  Rubber duck on the PEQ sleeve.  Credit to Casca174 on SH.

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Link Posted: 3/29/2021 9:08:20 PM EDT
[#50]
Anybody have any out of the way sources for an AEM5 threaded 5/8-24? I have looked in the obvious places that I know  about and they are all OOS.
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