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Mk 18 / CQBR (Page 1408 of 1424)
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Link Posted: 1/11/2021 6:11:44 PM EST
Well, we can't be letting this bullshit stop the CQBR signal :D.

Time for an SFMB/RC Update!

It's been just short of 2k rounds since switching to the SFMB and I'm finally starting to see some subtle changes in the wear pattern on the RC. Seems there's some very gradual erosion on the high points between the old 4P erosion channels, but it's very minor and it doesn't appear the "chips" where there's actual baffle penetration have enlarged despite how hard I've been running it.

I originally thought I'd see some minor erosion around the bore, but it's happening so slowly that it's really only started to be apparent recently. Also kinda interesting to note that the 4P erosion channels are starting to fill up with carbon.

Woo, baffle time-lapse:

13,300 (All 4P, prior to the SFMB)
Attachment Attached File


14,000
Attachment Attached File


14,500
Attachment Attached File


15,000
Attachment Attached File


Overall, I'm extremely happy with the switch and the reduction in erosion has surpassed any expectations I had. I've been running it much harder than I ever did with the 4P and there's barely any sign I've even been shooting it; that's pretty awesome.

There are a few downsides, like carbon being blown into the locking collar threads and possibly a bit more fouling in the action, but the trade-off is more than worth it IMO.
Link Posted: 1/11/2021 6:28:19 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:
If you guys haven't already, add AR15.com's direct IPs to your hosts file or save the IPs to go there directly.

3.138.255.236 ar15.com
3.139.193.203 ar15.com
3.20.37.167 ar15.com

While they'll possibly get around to pulling the AWS hosting, it's still up and accessible directly for now.

There is also: https://www.ar15-backup.com/
View Quote



Link Posted: 1/11/2021 6:35:52 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:
If you guys haven't already, add AR15.com's direct IPs to your hosts file or save the IPs to go there directly.

3.138.255.236 ar15.com
3.139.193.203 ar15.com
3.20.37.167 ar15.com

While they'll possibly get around to pulling the AWS hosting, it's still up and accessible directly for now.

There is also: https://www.ar15-backup.com/
View Quote

I don't know what any of that means but
Link Posted: 1/11/2021 7:03:17 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:

I don't know what any of that means but
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SecretSquirell:
Originally Posted By krdt:
If you guys haven't already, add AR15.com's direct IPs to your hosts file or save the IPs to go there directly.

3.138.255.236 ar15.com
3.139.193.203 ar15.com
3.20.37.167 ar15.com

While they'll possibly get around to pulling the AWS hosting, it's still up and accessible directly for now.

There is also: https://www.ar15-backup.com/

I don't know what any of that means but


Open Notepad (choose "run as administrator"). You can do this by going to Search, typing "Notepad" and then right clicking on Notepad and choosing "Run As Administrator".

Once in Notepad, go to File>Open; at the bottom of the window that pops up, to the right of "File Name" will be "Text Documents (*.txt)". Click the drop-down and select All Files (*.*) and navigate to:

C:\Windows\System32\drivers\etc

Open "hosts" and paste in the IPs/hostname as above. It'll look like this (you can add a comment as I did, or not -- comments are any line beginning with # and will be ignored/aren't part of the config file):



Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.

Link Posted: 1/11/2021 8:11:15 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:


Open Notepad (choose "run as administrator"). You can do this by going to Search, typing "Notepad" and then right clicking on Notepad and choosing "Run As Administrator".

Once in Notepad, go to File>Open; at the bottom of the window that pops up, to the right of "File Name" will be "Text Documents (*.txt)". Click the drop-down and select All Files (*.*) and navigate to:

C:\Windows\System32\drivers\etc

Open "hosts" and paste in the IPs/hostname as above. It'll look like this (you can add a comment as I did, or not -- comments are any line beginning with # and will be ignored/aren't part of the config file):

https://www.ar15-backup.com/media/mediaFiles/72167/hosts_example_jpg-1775386.JPG

Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.

View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:
Originally Posted By SecretSquirell:
Originally Posted By krdt:
If you guys haven't already, add AR15.com's direct IPs to your hosts file or save the IPs to go there directly.

3.138.255.236 ar15.com
3.139.193.203 ar15.com
3.20.37.167 ar15.com

While they'll possibly get around to pulling the AWS hosting, it's still up and accessible directly for now.

There is also: https://www.ar15-backup.com/

I don't know what any of that means but


Open Notepad (choose "run as administrator"). You can do this by going to Search, typing "Notepad" and then right clicking on Notepad and choosing "Run As Administrator".

Once in Notepad, go to File>Open; at the bottom of the window that pops up, to the right of "File Name" will be "Text Documents (*.txt)". Click the drop-down and select All Files (*.*) and navigate to:

C:\Windows\System32\drivers\etc

Open "hosts" and paste in the IPs/hostname as above. It'll look like this (you can add a comment as I did, or not -- comments are any line beginning with # and will be ignored/aren't part of the config file):

https://www.ar15-backup.com/media/mediaFiles/72167/hosts_example_jpg-1775386.JPG

Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.


Again
Link Posted: 1/11/2021 8:18:27 PM EST
Link Posted: 1/11/2021 9:44:26 PM EST
[Last Edit: 1/11/2021 9:44:51 PM EST by Badger52]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt: Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.

View Quote
I know "not tech" but given events today most relevant. And better than a pic of a CQBR Burro.
Just do this, as well as for those places that are critical to YOU.  Don't go nuts with your hostfile; making it too big will defeat the purpose.  But consider that 2 of the most ginormous DNS servers in use belong to Google, this is a sound precaution.  And resolving to those places will run like a turpentined cat.
Link Posted: 1/11/2021 10:07:35 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:


Open Notepad (choose "run as administrator"). You can do this by going to Search, typing "Notepad" and then right clicking on Notepad and choosing "Run As Administrator".

Once in Notepad, go to File>Open; at the bottom of the window that pops up, to the right of "File Name" will be "Text Documents (*.txt)". Click the drop-down and select All Files (*.*) and navigate to:

C:\Windows\System32\drivers\etc

Open "hosts" and paste in the IPs/hostname as above. It'll look like this (you can add a comment as I did, or not -- comments are any line beginning with # and will be ignored/aren't part of the config file):

https://www.ar15-backup.com/media/mediaFiles/72167/hosts_example_jpg-1775386.JPG

Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.

View Quote



Thank you!!
Link Posted: 1/11/2021 10:30:12 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Badger52:
I know "not tech" but given events today most relevant. And better than a pic of a CQBR Burro.
Just do this, as well as for those places that are critical to YOU.  Don't go nuts with your hostfile; making it too big will defeat the purpose.  But consider that 2 of the most ginormous DNS servers in use belong to Google, this is a sound precaution.  And resolving to those places will run like a turpentined cat.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Badger52:
Originally Posted By krdt: Choose "Save" and you'll now have the DNS for ar15.com resolved locally rather than relying on your ISP DNS server or an external DNS server. This will only work as long as Arfcom still has an active host at those IPs.

I know "not tech" but given events today most relevant. And better than a pic of a CQBR Burro.
Just do this, as well as for those places that are critical to YOU.  Don't go nuts with your hostfile; making it too big will defeat the purpose.  But consider that 2 of the most ginormous DNS servers in use belong to Google, this is a sound precaution.  And resolving to those places will run like a turpentined cat.


Whoa, whoa, whoa... let's not start talking crazy :\.
Link Posted: 1/12/2021 12:02:34 AM EST
@krdt

looks like you have a way to go. he is holding a mk18 with an elcan for the majority of this video

Link Posted: 1/12/2021 12:11:37 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JLAudio:
@krdt

looks like you have a way to go. he is holding a mk18 with an elcan for the majority of this video

https://www.youtube.com/watch?v=c0z93mBtECA
View Quote
80k rounds and only reworked once
Link Posted: 1/12/2021 6:41:51 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JLAudio:
It's been a pleasure knowing you all, thanks for all information over the years.

Just incase arfcom gets deleted from the internet.
View Quote
This better not be the case, but I've seen stranger things in the past week.
Link Posted: 1/12/2021 6:47:25 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FONTY:
I picked up 1 of those surplus DD MK18 rebuild kits.
Included parts
Barrel
Bolt
MK12 gb
Gas tube
Firing pin
Retaining pin
https://www.AR15.Com/media/mediaFiles/236598/4E476B32-3B3D-4DCD-9D99-528D386439C4_jpe-1768615.JPG
View Quote


Nice

How much were these surplus kits?

Anymore coming?
Link Posted: 1/12/2021 9:00:06 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:

Whoa, whoa, whoa... let's not start talking crazy :\.
View Quote
Yeah, don't know what came over me.  Channeling some serious hate for tyrants maybe.
Thanks.  Feel better now.


Link Posted: 1/12/2021 4:06:15 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:
Well, we can't be letting this bullshit stop the CQBR signal :D.

Time for an SFMB/RC Update!

It's been just short of 2k rounds since switching to the SFMB and I'm finally starting to see some subtle changes in the wear pattern on the RC. Seems there's some very gradual erosion on the high points between the old 4P erosion channels, but it's very minor and it doesn't appear the "chips" where there's actual baffle penetration have enlarged despite how hard I've been running it.

I originally thought I'd see some minor erosion around the bore, but it's happening so slowly that it's really only started to be apparent recently. Also kinda interesting to note that the 4P erosion channels are starting to fill up with carbon.

Woo, baffle time-lapse:

13,300 (All 4P, prior to the SFMB)
https://www.AR15.Com/media/mediaFiles/72167/CQBR_091520_RC_Baffle_13300-RSC-01_jpg-1775307.JPG

14,000
https://www.AR15.Com/media/mediaFiles/72167/CQBR_112120_RC_Baffle_14000-RS-05_jpg-1775311.JPG

14,500
https://www.AR15.Com/media/mediaFiles/72167/CQBR_122520_RC_Baffle_14432-RS-03_jpg-1775313.JPG

15,000
https://www.AR15.Com/media/mediaFiles/72167/CQBR_010921_RC_Baffle_15000-RS-06_jpg-1775315.JPG

Overall, I'm extremely happy with the switch and the reduction in erosion has surpassed any expectations I had. I've been running it much harder than I ever did with the 4P and there's barely any sign I've even been shooting it; that's pretty awesome.

There are a few downsides, like carbon being blown into the locking collar threads and possibly a bit more fouling in the action, but the trade-off is more than worth it IMO.
View Quote
Have you seen a difference in back pressure, gas to to the face, and a change to your recoil impulse after changing muzzle devices?
Link Posted: 1/12/2021 5:05:59 PM EST
[Last Edit: 1/12/2021 5:08:23 PM EST by krdt]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By JLAudio:
@krdt

looks like you have a way to go. he is holding a mk18 with an elcan for the majority of this video

https://www.youtube.com/watch?v=c0z93mBtECA
View Quote


Yeah, I saw it; pretty disappointing if I'm being honest. A very generic review with surprisingly few observations of interest and startingly little info/data provided as a result of hitting such a high round count.  

No mention of what sort of erosion he had by 40k or how many baffles he'd penetrated by the time he elected to rebuild (if used hard with mostly pronged mounts, I'd be very surprised if he hadn't burned through multiple baffles by 40k). No observations on performance loss over the life of the can from erosion and/or carbon accumulation, how often he was cleaning it (or the method), nor any mention of if/when he reached a point he was unable to remove a satisfactory amount of carbon/copper accumulation.

Hell, not even an explanation of what finally motivated him to rebuild -- I'm assuming accumulation, but even that isn't made entirely clear.  

Aside from the few passing references to the 80k total and rebuilding at 40k -- a number I consider nearly meaningless since it isn't accompanied by any other relevant data -- the high round count was basically immaterial to the content of the video. I expected he'd have at least one or two interesting insights gleaned as a result of reaching the end of the life of the can nearly twice over; but apparently not. Not to toot my own horn, but I'd submit that I've put out significantly more hard data and useful information after 15k than his review at 80k.

I realize not everyone is as interested in detailed data as I am, but it seems almost ridiculous to make a big deal of doing a review at 80k and then only provide generic information without a single meaningful observation on long-term wear or performance. What's the point? All in all, he could've done the same review after 2-3k and it wouldn't have made any significant difference.
Link Posted: 1/12/2021 5:20:29 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:


Yeah, I saw it; pretty disappointing if I'm being honest. A very generic review with surprisingly few observations of interest and startingly little info/data provided as a result of hitting such a high round count.  

No mention of what sort of erosion he had by 40k or how many baffles he'd penetrated by the time he elected to rebuild (if used hard with mostly pronged mounts, I'd be very surprised if he hadn't burned through multiple baffles by 40k). No observations on performance loss over the life of the can from erosion and/or carbon accumulation, how often he was cleaning it (or the method), nor any mention of if/when he reached a point he was unable to remove a satisfactory amount of carbon/copper accumulation.

Hell, not even an explanation of what finally motivated him to rebuild -- I'm assuming accumulation, but even that isn't made entirely clear.  

Aside from the few passing references to the 80k total and rebuilding at 40k -- a number I consider nearly meaningless since it isn't accompanied by any other relevant data -- the high round count was basically immaterial to the content of the video. I expected he'd have at least one or two interesting insights gleaned as a result of reaching the end of the life of the can nearly twice over; but apparently not. Not to toot my own horn, but I'd submit that I've put out significantly more hard data and useful information after 15k than his review at 80k.

I realize not everyone is as interested in detailed data as I am, but it seems almost ridiculous to make a big deal of doing a review at 80k and then only provide generic information without a single meaningful observation on long-term wear or performance. What's the point? All in all, he could've done the same review after 2-3k and it wouldn't have made any significant difference.
View Quote
Yeah he kinda just said "built like a tank" and then moved on. Degradation of it's performance over time would've been nice
Link Posted: 1/12/2021 5:22:44 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FailureToFun:
Have you seen a difference in back pressure, gas to to the face, and a change to your recoil impulse after changing muzzle devices?
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By FailureToFun:
Originally Posted By krdt:
Well, we can't be letting this bullshit stop the CQBR signal :D.

Time for an SFMB/RC Update!

It's been just short of 2k rounds since switching to the SFMB and I'm finally starting to see some subtle changes in the wear pattern on the RC. Seems there's some very gradual erosion on the high points between the old 4P erosion channels, but it's very minor and it doesn't appear the "chips" where there's actual baffle penetration have enlarged despite how hard I've been running it.

I originally thought I'd see some minor erosion around the bore, but it's happening so slowly that it's really only started to be apparent recently. Also kinda interesting to note that the 4P erosion channels are starting to fill up with carbon.

Woo, baffle time-lapse:

13,300 (All 4P, prior to the SFMB)
https://www.AR15.Com/media/mediaFiles/72167/CQBR_091520_RC_Baffle_13300-RSC-01_jpg-1775307.JPG

14,000
https://www.AR15.Com/media/mediaFiles/72167/CQBR_112120_RC_Baffle_14000-RS-05_jpg-1775311.JPG

14,500
https://www.AR15.Com/media/mediaFiles/72167/CQBR_122520_RC_Baffle_14432-RS-03_jpg-1775313.JPG

15,000
https://www.AR15.Com/media/mediaFiles/72167/CQBR_010921_RC_Baffle_15000-RS-06_jpg-1775315.JPG

Overall, I'm extremely happy with the switch and the reduction in erosion has surpassed any expectations I had. I've been running it much harder than I ever did with the 4P and there's barely any sign I've even been shooting it; that's pretty awesome.

There are a few downsides, like carbon being blown into the locking collar threads and possibly a bit more fouling in the action, but the trade-off is more than worth it IMO.
Have you seen a difference in back pressure, gas to to the face, and a change to your recoil impulse after changing muzzle devices?


Gas to the face, no; changes to recoil impulse, no.

It's possible there might be a minor increase in backpressure fouling in the action, but I'm starting to doubt that and think it was almost entirely a result of ammo. Unfortunately, the MD switch corresponded exactly with me switching from 55gr to 62gr bullets and a higher pressure powder charge, which made any initial observations pretty useless. I did have some issues with my safety locking up and the BCG coming close due to hard carbon fouling (which had never been an issue prior to switching), but I've since lowered my powder charge and the issue has disappeared.

I put 400rds through it a couple of days ago and fouling was no more than usual prior to the switch. The main difference that stands out at this point is carbon getting into the locking ring threads.
Link Posted: 1/12/2021 6:23:44 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By krdt:The main difference that stands out at this point is carbon getting into the locking ring threads.
View Quote
So basically just something that becomes another routine PM task, yes?  (non-can owner here)
Link Posted: 1/12/2021 6:49:29 PM EST
[Last Edit: 1/12/2021 7:48:03 PM EST by LsuJon]
So has anyone run into any issues w/ surplus uppers? It seems there has been allot of them flooding the market and I have an opportunity to snag a pretty cool / rare one so I was just wondering. Maybe @Combat_Diver can shed some light on the process of these upper parts becoming surplus?
Link Posted: 1/12/2021 7:26:36 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
So has anyone run into any issues w/ surplus uppers? It seems there has been allot of them flooding the market and I have an opportunity to snag a pretty cool / rare one so I was just wondering. Maybe @Combat_Figer can shed some light on the process of these upper parts becoming surplus?
View Quote


I dunno about @Combat_Figer, but perhaps @Combat_Diver can weigh in
Link Posted: 1/12/2021 7:41:53 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Badger52:
So basically just something that becomes another routine PM task, yes?  (non-can owner here)
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Badger52:
Originally Posted By krdt:The main difference that stands out at this point is carbon getting into the locking ring threads.
So basically just something that becomes another routine PM task, yes?  (non-can owner here)


Yep, pretty much. A slight bit of a pain because you have to pull the collar apart to clean the threads, but not a terribly big deal.

I'm sure if you left it long enough it'd start to be an issue and require a strap wrench to loosen the collar. So far, I've been pulling it apart and sticking the base in the ultrasonic with the collar removed when it starts getting noticeably sticky.
Link Posted: 1/12/2021 7:48:26 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By AZ_SBR:


I dunno about @Combat_Figer, but perhaps @Combat_Diver can weigh in
View Quote

FML...
Link Posted: 1/12/2021 10:00:07 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
So has anyone run into any issues w/ surplus uppers? It seems there has been allot of them flooding the market and I have an opportunity to snag a pretty cool / rare one so I was just wondering. Maybe @Combat_Diver can shed some light on the process of these upper parts becoming surplus?
View Quote


I haven’t heard on what Crane is doing. All my excess goes back to Crane.

CD
Link Posted: 1/12/2021 10:04:22 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Combat_Diver:


I haven't heard on what Crane is doing. All my excess goes back to Crane.

CD
View Quote
So it's just your spares and not out of spec/ worn out parts?
Link Posted: 1/13/2021 12:56:06 AM EST
[Last Edit: 1/13/2021 12:57:11 AM EST by Combat_Diver]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
So it's just your spares and not out of spec/ worn out parts?
View Quote



Out of spec/worn parts go into the shredder for destruction.  Not cost effective to send busted stuff from Afghanistan to Indiana.

CD
Link Posted: 1/13/2021 11:39:09 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
So has anyone run into any issues w/ surplus uppers? It seems there has been allot of them flooding the market and I have an opportunity to snag a pretty cool / rare one so I was just wondering. Maybe @Combat_Diver can shed some light on the process of these upper parts becoming surplus?
View Quote

Where are you all sourcing the surplus ones from mainly? Not your specific rare one but in general
Link Posted: 1/13/2021 11:43:16 AM EST
Discussion ForumsJump to Quoted PostQuote History
View Quote


Very nice
Link Posted: 1/13/2021 2:18:26 PM EST
Where are yall getting these surplus kits?
Link Posted: 1/13/2021 3:06:39 PM EST
[Last Edit: 1/13/2021 3:07:08 PM EST by THEdtw]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By lxranes:
Where are yall getting these surplus kits?
View Quote

Thoroughbred Armament.  Big batch is sold out, but you never know when stuff is going to get listed.  Instagram is the best place to keep up to date with them.  Stuff goes quick.
Link Posted: 1/13/2021 3:24:47 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Combat_Diver:



Out of spec/worn parts go into the shredder for destruction.  Not cost effective to send busted stuff from Afghanistan to Indiana.

CD
View Quote
Appreciate all your knowledge!
Link Posted: 1/13/2021 4:06:10 PM EST
[Last Edit: 1/13/2021 4:44:27 PM EST by LsuJon]
Attachment Attached File


The placement of these numbers seem off (too far forward), has anyone seen anything that would suggest these weren't an attempt to make normal uppers look legit/cooler?

Edit: specifically looking at the top upper there seems to be something blotted out where the numbers are typically found
Link Posted: 1/13/2021 5:12:10 PM EST
Link Posted: 1/13/2021 5:14:28 PM EST
Link Posted: 1/13/2021 6:58:44 PM EST
[Last Edit: 1/13/2021 7:00:10 PM EST by StowaNewb]
I should have my stamp for my Surefire Socom RC very soon (hopefully). While messing around on Youtube, I came across this video
Suppressor Bore Alignment Rods


I'm kind of annoyed that I have to spend $70 on a single steel rod after I just bought the suppressor, a surefire flash hider, a reaction rod, and paid for a stamp. Are these bore rods necessary, or is this just one more thing for Surefire peddle? Thank you in advance.
Link Posted: 1/13/2021 6:58:57 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
https://www.ar15.com/media/mediaFiles/316069/7F17C9FC-677B-4CFB-AC55-EE3559424F0B_jpe-1777902.JPG

The placement of these numbers seem off (too far forward), has anyone seen anything that would suggest these weren't an attempt to make normal uppers look legit/cooler?

Edit: specifically looking at the top upper there seems to be something blotted out where the numbers are typically found
View Quote


Thought the same thing. Placement is off, font is off, Missing UID (which could have come off) and within this serial range they are FN uppers
Link Posted: 1/13/2021 7:15:06 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By rcfallen:


Thought the same thing. Placement is off, font is off, Missing UID (which could have come off) and within this serial range they are FN uppers
View Quote
Is there a place to check serial number ranges? I always thought that the numbers were matched to the lowers.
Link Posted: 1/13/2021 7:48:18 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LsuJon:
Is there a place to check serial number ranges? I always thought that the numbers were matched to the lowers.
View Quote


Not that I'm aware. I dont think the serials match the lowers either. Unless you have heard different. I think its just a sequential number assigned as they are assembled and inspected.
Link Posted: 1/13/2021 7:57:05 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By rcfallen:


Not that I'm aware. I dont think the serials match the lowers either. Unless you have heard different. I think its just a sequential number assigned as they are assembled and inspected.
View Quote
Ok just wondering how you were able to determine these numbers went w/ FN. I messaged him so I'm waiting to see what he says but at this point seems like a poor attempt to turn more of a profit on some colt keyholes.
Link Posted: 1/13/2021 8:23:33 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By StowaNewb:
I should have my stamp for my Surefire Socom RC very soon (hopefully). While messing around on Youtube, I came across this video https://www.youtube.com/watch?v=Ktwt-6J-Zro

I'm kind of annoyed that I have to spend $70 on a single steel rod after I just bought the suppressor, a surefire flash hider, a reaction rod, and paid for a stamp. Are these bore rods necessary, or is this just one more thing for Surefire peddle? Thank you in advance.
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Most new production barrels should have concentric threads unless you bought some no name bottom of the barrel, barrel. Make sure your muzzle device is properly threaded on and the shims mate to the shoulder of the barrel all the the way around and you should be good. I have several suppressors and have never used a rod. I use 3 methods to double check before shooting for the first time.

1. remove the upper from the lower, mount suppressor, look down the business end and you should be able to see clearly from the suppressor all the way out the back of the receiver. No half moon or obstruction, should be a complete circle.

2. Same as above but from the receiver end down through the suppressor - perfect circle.

3. Place the upper on the lower, lock the bolt back and shine a flashlight from the suppressor end cap and it should project a perfect circle on the bolt face. Again, no half moon, a perfect circle.

4. Buy a couple boxes of ammo with the $70.
Link Posted: 1/13/2021 8:46:22 PM EST
Been busy, but I finally got a chance to scrub down my Savannah kit.  06/09 cut down Colt gov profile barrel and an "SDI" bcg(I've been told Sabre Defense).  Also I know nothing about how DD manufactures their rails, but I found it interesting that the lot numbers are the same, but the upper and lower piece differ by 2 days.  23OCT07 VS 25OCT07

Hopefully I'll get it put together tomorrow.  Should pair nicely with a salty police trade in Colt AF upper I have.









Link Posted: 1/13/2021 9:27:19 PM EST
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Originally Posted By StowaNewb:
I should have my stamp for my Surefire Socom RC very soon (hopefully). While messing around on Youtube, I came across this video https://www.youtube.com/watch?v=Ktwt-6J-Zro

I'm kind of annoyed that I have to spend $70 on a single steel rod after I just bought the suppressor, a surefire flash hider, a reaction rod, and paid for a stamp. Are these bore rods necessary, or is this just one more thing for Surefire peddle? Thank you in advance.
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I only do a visual inspection.

Attach the can, remove the BCG, and hold the upper up to a light background looking down the bore from the rear. Any serious misalignment is going to be immediately apparent as described above, i.e. a visible 1/4-1/2 moon. However, you also want to look for any less obvious misalignment by visually centering the bore and then slowly moving the rear of the upper to the right, back to center, to the left, back to the center, and so on; then the same up and down. Even if you have no indication of an obstruction when centered, you still want to verify one side isn't noticeably closer to the center than the other (you can still have misalignment short of a full-on visible obstruction).

You can also look from the muzzle end and verify the bore is centered inside the can -- again you don't want it to be biased more or less in any direction.

To summarize, I don't feel alignment rods are really necessary, but I suppose it comes down to how much faith you have in the calibration of your Mk-1 Eyeball.
Link Posted: 1/13/2021 10:08:58 PM EST
[Last Edit: 1/13/2021 10:12:16 PM EST by thelegend1]
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Originally Posted By rcfallen:


Thought the same thing. Placement is off, font is off, Missing UID (which could have come off) and within this serial range they are FN uppers
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Originally Posted By rcfallen:
Originally Posted By LsuJon:
https://www.ar15.com/media/mediaFiles/316069/7F17C9FC-677B-4CFB-AC55-EE3559424F0B_jpe-1777902.JPG

The placement of these numbers seem off (too far forward), has anyone seen anything that would suggest these weren't an attempt to make normal uppers look legit/cooler?

Edit: specifically looking at the top upper there seems to be something blotted out where the numbers are typically found


Thought the same thing. Placement is off, font is off, Missing UID (which could have come off) and within this serial range they are FN uppers


Have seen a couple with that number placement.

Edit: Don't think the bottom pic has the forward number placement

Link Posted: 1/13/2021 10:17:50 PM EST
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Originally Posted By thelegend1:


Have seen a couple with that number placement.

Edit: Don't think the bottom pic has the forward number placement
https://i.postimg.cc/768QDGFc/FB-IMG-1594317833540.jpg
https://i.postimg.cc/L66QHMWH/VZrJyam.jpg
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Originally Posted By thelegend1:
Originally Posted By rcfallen:
Originally Posted By LsuJon:
https://www.ar15.com/media/mediaFiles/316069/7F17C9FC-677B-4CFB-AC55-EE3559424F0B_jpe-1777902.JPG

The placement of these numbers seem off (too far forward), has anyone seen anything that would suggest these weren't an attempt to make normal uppers look legit/cooler?

Edit: specifically looking at the top upper there seems to be something blotted out where the numbers are typically found


Thought the same thing. Placement is off, font is off, Missing UID (which could have come off) and within this serial range they are FN uppers


Have seen a couple with that number placement.

Edit: Don't think the bottom pic has the forward number placement
https://i.postimg.cc/768QDGFc/FB-IMG-1594317833540.jpg
https://i.postimg.cc/L66QHMWH/VZrJyam.jpg
That bottom picture is soooo confusing to me.
Link Posted: 1/13/2021 10:26:36 PM EST
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Originally Posted By Theodoric:
That bottom picture is soooo confusing to me.
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It was COTS testing for DMs. Lol
Link Posted: 1/13/2021 10:27:52 PM EST
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Originally Posted By thelegend1:


Have seen a couple with that number placement.

Edit: Don't think the bottom pic has the forward number placement
https://i.postimg.cc/768QDGFc/FB-IMG-1594317833540.jpg
https://i.postimg.cc/L66QHMWH/VZrJyam.jpg
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But that top pic is the first I've seen if it in that location. Contacted the seller and he is going to forward some more photos of the #s that forward location.
Link Posted: 1/13/2021 11:13:07 PM EST
[Last Edit: 1/13/2021 11:49:49 PM EST by rcfallen]
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Originally Posted By thelegend1:


Have seen a couple with that number placement.

Edit: Don't think the bottom pic has the forward number placement
https://i.postimg.cc/768QDGFc/FB-IMG-1594317833540.jpg
https://i.postimg.cc/L66QHMWH/VZrJyam.jpg
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Haven't seen those pics before, good find! Font is still not the same though on the uppers in question. Doesn't seem as thick
Link Posted: 1/14/2021 10:07:26 AM EST
Attachment Attached File

Attachment Attached File

Attachment Attached File


Navy guns from 16'

Todays range training, 600 rds of 5.56 and 260 rds of 9mm
Attachment Attached File


CD
Link Posted: 1/14/2021 1:18:38 PM EST
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Originally Posted By Combat_Diver:
Todays range training, 600 rds of 5.56 and 260 rds of 9mm
https://www.ar15.com/media/mediaFiles/32677/IMG_3879_jpg-1778791.JPG

CD
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Jeez, that’s like $700 worth of ammo here stateside right now.
Link Posted: 1/14/2021 8:29:45 PM EST
[Last Edit: 1/14/2021 8:32:53 PM EST by BurtSaun1049]
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Originally Posted By StowaNewb:
I should have my stamp for my Surefire Socom RC very soon (hopefully). While messing around on Youtube, I came across this video
https://www.youtube.com/watch?v=Ktwt-6J-Zro

I'm kind of annoyed that I have to spend $70 on a single steel rod after I just bought the suppressor, a surefire flash hider, a reaction rod, and paid for a stamp. Are these bore rods necessary, or is this just one more thing for Surefire peddle? Thank you in advance.
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You don't have to spend $70.

Get one from McMaster-Carr for $5.12. The other ones are a scam.

8893K193     Tight-Tolerance Oil-Hardening O1 Tool Steel Rod, 0.2188" Diameter, 3 Feet Long   1  $5.12

*ETA: if anyone wants the size for .300 BLK:
8893K219     Tight-Tolerance Oil-Hardening O1 Tool Steel Rod, 0.2969" Diameter, 3 Feet Long   1  $6.67
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