The BIG Mega MaTen Answer thread (FAQ covering LPK, Barrels, Bolts, Stocks, EXT) Check here first! - Page 21

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[ARCHIVED THREAD] - The BIG Mega MaTen Answer thread (FAQ covering LPK, Barrels, Bolts, Stocks, EXT) Check here first! (Page 21 of 52)

Posted: 5/17/2013 2:04:33 PM EDT

[#1]

Anyone sbr one of these

Posted: 5/17/2013 11:22:56 PM EDT

[#2]

BCG
http://www.762industries.com/DPMS-Pattern-308-Bolt-Carrier-Assembly-NEW-B00CN3V844.htm

Posted: 5/28/2013 1:05:15 PM EDT

[#3]

Picked up a 762 industries BCG, looks real nice...

I also have an ar10 bcg coming in and if its as nice or nicer, I will go that dirtection so that I can use a Noveske Barrel. Noveske fanboy, unashamed.

Posted: 5/28/2013 3:40:55 PM EDT

[#4]

Getting closer with my MKM extended length 260 remington build. Waiting on my BCG from Harris Tactical. Then just need to install the Giessle DMR trgger, ambi safety select, GG&G heavyduty bipod, Trijicon 5x20 Accupoint and she will be ready for the range!

http://i2.photobucket.com/albums/y32/f22pwrdaccord/null_zps63595896.jpg

Posted: 6/3/2013 12:45:02 AM EDT

[#5]

Just started collecting parts for mine heres my list so far...

MKM extended upper and lower set
Mega 20" barrel
DPMS BCG
Geissele ssa-e trigger
magpul grip
lpk to finish the lower
buffer/spring/tube
rainier match grade low pro gas block

Still looking for:
PRS stock
flash hider ( dont know what direction i want to go yet)

Just collected parts that were readily available... with the market the way it is I didnt want to wait months to a year to get my "dream" parts. But I will probably upgrade some parts down the road.

Posted: 6/3/2013 2:06:35 PM EDT

[#6]

Ill join in as well. Im picking up my Mega receiver set tonight.

Wish list:
Mega standard receiver set
PRI Delta handguard
Mega 20" Barrel
Youngs BCG(if I can ever find one) with JP bolt
PRI flip up front sight/gas block if it works.
Magpul UBR or MOE fixed stock.
Geiselle SD Combat or Enhanced
Either a DD LPK or Armalite LPK.
Larue APEG grip.

Thats my wish list. Im picking up my receivers today, and ordering the forearm and barrel tomorrow then start saving for everything else.

Posted: 6/3/2013 5:53:15 PM EDT

[#7]

Had the barrel fluted to knock off some weight and add some sex appeal, haha

Posted: 6/3/2013 6:27:58 PM EDT

[#8]

For those of you trying to install the mag catch and button. Here is a response from Mega on that:

Remove the bolt catch using a 1/16 allen wrench, hold the magazine catch spring and button in on the left side of the unit. This is opposite of how to install of the AR-15.
ONLY thread half of the button on. If you go all the way, the spring will not be able to compress.

Posted: 6/3/2013 10:05:02 PM EDT

[#9]

Quoted:
Had the barrel fluted to knock off some weight and add some sex appeal, haha

<a href="http://imageshack.us/photo/my-images/835/img0052rhl.jpg/" target="_blank">http://imageshack.us/scaled/medium/835/img0052rhl.jpg</a>
<a href="http://imageshack.us/photo/my-images/163/img0053ck.jpg/" target="_blank">http://imageshack.us/scaled/medium/163/img0053ck.jpg</a>
<a href="http://imageshack.us/photo/my-images/27/img0054mn.jpg/" target="_blank">http://imageshack.us/scaled/medium/27/img0054mn.jpg</a>
<a href="http://imageshack.us/photo/my-images/51/img0055wp.jpg/" target="_blank">http://imageshack.us/scaled/medium/51/img0055wp.jpg</a>
<a href="http://imageshack.us/photo/my-images/841/img0056hr.jpg/" target="_blank">http://imageshack.us/scaled/medium/841/img0056hr.jpg</a>

What make of barrel is that and where did you have the fluting done?

Edit: Never mind seen specs on previous e page. Nice build by the way.

Posted: 6/4/2013 10:35:20 PM EDT

[#10]

Ok, build complete. Mega upper/lower, harris tactical BCG, AR-10 PRS with DPMS rifle length spring and buffer. 20" mega barrel, rainier gas block, yankee hill gas tube. PWS FSC30.

American eagle and fusion 150 grain and 180 grain ammo respectively. Very low felt recoil, like surprisingly low.

First day at the range, failed to cycle. A few rounds ejected on their own, but didn't feed the next round. Most rounds extracted about 80% out of the chamber but didn't eject.

It cycles perfectly when I run it by hand with the charging handle, but it is significantly more force than my ar-15. I know it should be more, but it was more than expected.

I just ordered a wolf light recoil spring from brownells. Should this fix it, or do I need to look at something else.

Thanks.

OBTW barrel is awesome, under 1" at around 125 yds, much more accurate than the operator.

Posted: 6/5/2013 12:18:29 AM EDT

[#11]

Hi,
I am building a Mega Maten with an 18" Mega Barrel. This is my first full AR build and I'd like to use the Troy BattleRail TRX in 12 or 13.8 (have not decided yet). I would like to confirm the following please:

- The DPMS High Profile rail (3/16) would be the correct item
- Is anyone using the 12 or 13.8 (I'm having a tough time deciding with to go with)?
- The Troy BattleRail Barrel nut is all I need to install the barrel and the rail system
- A standard armorers wrench can be used with the Troy barrel nut

Thank you for your time and consideration.

Posted: 6/5/2013 12:07:26 PM EDT

[#12]

@DGW- Make SURE what you are using for a buffer and buffer spring is for AR-10! For instance, with that fixed position PRS, use a "standard" .308 buffer, and a "standard" .308 buffer spring. As far as buffering is concerned, nothing can transfer over to the MATEN from AR-15. SO, first make sure what you have is for .308, and make sure the Wolf spring you ordered is not for AR-15, because it wont work. If this does not help, I would look into making sure you gas block is positioned over the gas hole correctly.

Posted: 6/5/2013 2:11:18 PM EDT

[#13]

Mega32, It is a standard extension tube, and 308 buffer and 308 std buffer spring. DPMS mark 1 mod 0, nothing fancy.

The hasty, ready shoot aim, brownells order is for the wrong spring, so that won't help.

I can't find any reduced buffer springs for a 308 so I think I have to start looking at the gas block.

Any thing else I could be missing?

Posted: 6/5/2013 2:18:08 PM EDT

[#14]

I found the armalite AR-10 spring does anyone know if the armalite or the DPMS is a heavier spring?

Posted: 6/5/2013 4:28:39 PM EDT

[#15]

I think the Armalite spring is heavier. You use the Armalite AR10 spring in either rifle or carbine setups. But Armalite uses a H3 buffer with AR10 spring in their carbines.

I know that Armalite uses a special rifle buffer, its slightly shorter than the AR15. Not sure if DPMS is the same way, but thats something you could look at.

My plan is to use the Armalite buffer setup as opposed to DPMS style.

If you go with a lighter spring, that will make the recoil impulse feel sharper. XP spring will allow more pressure against the BCG and a more consistent chambering as opposed to the light spring. Thats what I have been told atleast, never really double checked on that, just sounded like it made sense so I didnt question it. Hopefully Im not spreading incorrect info.

Hope you figure out the issues, Im picking up my receivers this weekend. Gotta go to the gunshow to pick them up because the shop Im going to is closed for the show this weekend. Living in Houston sucks. Gotta plan a whole day just to drive across town.

Posted: 6/5/2013 4:43:28 PM EDT

[#16]

Im thinking it is a gas block issue. According to google I am the only person on the planet that has looked for a lighter 308 spring.

So, looking at adjustable gas blocks. Syrac has a 308 specific gas block. Is there a difference between ar-15 and ar-308 gas blocks?

Recomendations for an adjustable, PRI or Seekins?

Thanks

Posted: 6/5/2013 5:23:55 PM EDT

[#17]

Quoted:
Im thinking it is a gas block issue. According to google I am the only person on the planet that has looked for a lighter 308 spring.

So, looking at adjustable gas blocks. Syrac has a 308 specific gas block. Is there a difference between ar-15 and ar-308 gas blocks?

Recomendations for an adjustable, PRI or Seekins?

Thanks

Paladin Machine 3 position gas block.

Posted: 6/5/2013 7:39:14 PM EDT

[#18]

Quoted:
Had the barrel fluted to knock off some weight and add some sex appeal, haha

<a href="http://imageshack.us/photo/my-images/835/img0052rhl.jpg/" target="_blank">http://imageshack.us/scaled/medium/835/img0052rhl.jpg</a>
<a href="http://imageshack.us/photo/my-images/163/img0053ck.jpg/" target="_blank">http://imageshack.us/scaled/medium/163/img0053ck.jpg</a>
<a href="http://imageshack.us/photo/my-images/27/img0054mn.jpg/" target="_blank">http://imageshack.us/scaled/medium/27/img0054mn.jpg</a>
<a href="http://imageshack.us/photo/my-images/51/img0055wp.jpg/" target="_blank">http://imageshack.us/scaled/medium/51/img0055wp.jpg</a>
<a href="http://imageshack.us/photo/my-images/841/img0056hr.jpg/" target="_blank">http://imageshack.us/scaled/medium/841/img0056hr.jpg</a>

What gas block is that?

Posted: 6/7/2013 1:04:02 PM EDT

[#19]

My AR guru fixed it. Used a carbine buffer instead of the full size dpms 308 buffer. Runs like a champ now.

Posted: 6/9/2013 12:12:45 PM EDT

[#20]

Quoted:
My AR guru fixed it. Used a carbine buffer instead of the full size dpms 308 buffer. Runs like a champ now.

Good to know. Thanks for the update. Is there an explanation as to why you needed a carbine buffer with the prs stock?

Posted: 6/9/2013 6:04:42 PM EDT

[#21]

Quoted:

Quoted:
My AR guru fixed it. Used a carbine buffer instead of the full size dpms 308 buffer. Runs like a champ now.

Good to know. Thanks for the update. Is there an explanation as to why you needed a carbine buffer with the prs stock?

I'm a little confused on this one. The PRS for the SR25/AR-10 needs a rifle length spring and buffer. So I don't know why you would need a carbine buffer. The only other thing I can think of is bolt carrier group is an Armalite and thus won't work with a DPMS rifle length buffer.

Posted: 6/10/2013 10:38:00 AM EDT

[#22]

maybe he meant he used a carbine initially instead of the rifle buffer. If not, I am confused as well.

Posted: 6/10/2013 11:43:09 AM EDT

[#23]

It is all dpms. Rifle length spring and buffer. The BCG wasn't cycling all the way back. It was extracting from the chamber but not far enough to eject or pick up the next round. My initial concern was not enough gas or spring was too strong. Checked the gas block and tube. No issues. My gun guy said it is easier to change to a smaller buffer rather than reduce spring pressure which could effect feeding. The new buffer is a spikes carbine, hs-2 I believe.

So my choice was to keep the relatively heavy rifle buffer and try to find a new light spring, or reduce the weight of the buffer and keep the same spring.

Plus the spikes buffer looks real cool.

Posted: 6/10/2013 11:38:00 PM EDT

[#24]

And so it begins...

https://lh3.googleusercontent.com/-lDFu7Dgsmco/UbaZzqZiKJI/AAAAAAAAR14/nXG_r_LAVI8/s640/1.JPG

https://lh6.googleusercontent.com/-ddxFRPrxamM/UbaZzgoZTqI/AAAAAAAAR18/2Nb339tR8oM/s640/2.JPG

https://lh6.googleusercontent.com/-O_Acpvp9qqw/UbaZzrlNtQI/AAAAAAAAR2A/xSms7l3fXwg/s640/3.JPG

Posted: 6/10/2013 11:57:47 PM EDT

[#25]

Those are so clean!!! I pick up my extended keymod set on Monday. Have almost all my parts in. I cant wait!

Posted: 6/11/2013 10:51:55 PM EDT

[#26]

More goodies...

Posted: 6/14/2013 7:59:47 PM EDT

[#27]

So, with the new buffer and a solid cleaning it is running flawless now..... well kinda. It really likes the 180 grain .308 rds 100% for 50 straight rds, it is about 90% reliable with 150 grain .308 rds, and 0% reliable with M80 cheap brazilian 7.62 nato rds. At first it was about 25% with the 150 grain but way better after a full cleaning. When it fails it is a failure to eject, or if it ejects it doesn't cycle far enough to pick up the next round.

My question, you ask.

Will this get better as the gun gets broken in or is it just going to be "finicky" for ever?

Posted: 6/14/2013 8:06:15 PM EDT

[#28]

Range report for the 20" MEGA barrel.

With a 12 rds string of fire of Fusion 180 grain .308, prone on the ground with bipod and monopod, 5-12 kts crosswind, Millett TRS on a Larue mount, got a 5" group at 300 yds. Yes I know 12 rds is not standard for grouping but it's hot and 300 yds X 2 is a lot of walking.

Keep in mind this is my first rifle ever with a magnified optic, and the first time I have looked through a scope in about 10 years. Better glass, better operator, BTHP rounds, I'm sure it would come down to 1 MOA at least or at most, whatever.

Overall, I'm pleased. For the money I think it is a great barrel.

Posted: 6/15/2013 4:45:15 AM EDT

[#29]

Quoted:
So, with the new buffer and a solid cleaning it is running flawless now..... well kinda. It really likes the 180 grain .308 rds 100% for 50 straight rds, it is about 90% reliable with 150 grain .308 rds, and 0% reliable with M80 cheap brazilian 7.62 nato rds. At first it was about 25% with the 150 grain but way better after a full cleaning. When it fails it is a failure to eject, or if it ejects it doesn't cycle far enough to pick up the next round.

My question, you ask.

Will this get better as the gun gets broken in or is it just going to be "finicky" for ever?

With one round loaded if it FTE does the bolt lock to the rear?

I am assuming you have already double checked your gas block?

How clean is clean? White glove or black rag? Make sure there's no build up on the carrier or gas tube.

Posted: 6/15/2013 5:43:59 PM EDT

[#30]

Posted: 6/15/2013 7:58:41 PM EDT

[#31]

Hey Stickman, you happen to have any MaTen rifles setup with the PRI Delta handguard? Thats what I want to use on my Mega build. Just want some photos to oogle for a while.

Posted: 6/15/2013 8:22:21 PM EDT

[#32]

Quoted:
So, with the new buffer and a solid cleaning it is running flawless now..... well kinda. It really likes the 180 grain .308 rds 100% for 50 straight rds, it is about 90% reliable with 150 grain .308 rds, and 0% reliable with M80 cheap brazilian 7.62 nato rds. At first it was about 25% with the 150 grain but way better after a full cleaning. When it fails it is a failure to eject, or if it ejects it doesn't cycle far enough to pick up the next round.

My question, you ask.

Will this get better as the gun gets broken in or is it just going to be "finicky" for ever?

It took about 300 rounds to break in mine and my brother's. I had a Noveske barrel with armalite BCG and my brother has a Rainier barrel with DPMS bolt. Cheap PRVI 147grn pretty much never worked reliably even after the break in but once broken in, we could do 100+ rounds of 168gr (FGMM or PRVI) without a hiccup. Until you get that point, run the rifle wet.

Posted: 6/18/2013 1:14:57 AM EDT

[#33]

For the people that have mega barrels how do you like them so far?

I already have a mega 20" barrel but am debated forking up the money to get a JP barrel and matching bolt

Posted: 6/21/2013 1:32:01 AM EDT

[#34]

Posted: 6/21/2013 1:35:33 PM EDT

[#35]

arent kns a no no with Geissele triggers?

Posted: 6/21/2013 3:10:09 PM EDT

[#36]

Let me know how your 762Industries + MEGA barrel combo goes.

I did the same BCG with a 16" MEGA barrel and here's what I found:

The MEGA barrel claims sub MOA so its chamber is CRAZY tight. The 762 Industries BCG claims to be National Match so its
tolerances are CRAZY tight. For example, a DPMS barrel and bolt face combo are .002" longer. The bolt face on my DPMS BCG is 0.124"
deep while the bolt face on my 762I bolt is 0.125 (I measure 0.126" but manu. says 0.125).

The result was that I couldn't close the BCG on a Forster 308 1.630" GO gauge, at least no without pushing hard and having no way to get it apart again.

Interestingly the bolt WOULD close on a Federal M80 7.62x51 cartridge. According to the specs 7.62x51 has a rim that is just a tiny bit thinner than .308 Win.
I filled a magazine with rounds and hand-cycled them through, letting the BCG slam home each time.

After I did that a couple times I WAS able to get the BCG to seat on a GO gauge but it was T-I-G-H-T!!

I did some test shooting. I had on big gardening gloves and looked away for that first shot!

Everything worked fine. The gun shoots beautifully and had no problems with 762 or a couple of AE 308s I tried. I can see little bits of NiB coating flecking off the
back sides of the bolt teeth but I image that is to be expected. Out of 40 rounds fired I had 2 failures to eject. Dunno why.

Spoke to both MEGA and 7.62 Industries and both seemed to think the above is normal. I told them both the story and they seemed to think just putting lead
downrange would cure the issues. Basically they just need to wear each other in (the bolt and barrel extension). The guy at MEGA said 500 rounds.

FYI, it is definitely the 762I bolt that is tight. If I put a DPMS bolt in the 762I carrier it seats easily over a GO gauge. Amazing what 1/1000" will do!

Curious to know other people's experiences! Also curious to know if people think it's a waste to have a NM BCG in a 16" CQB/medium range MATEN. I could
put it in my Fulton Armory FA-10 22" Critereon instead and put the DPMS bolt in the MEGA.

-Stooxie

Posted: 6/21/2013 3:37:51 PM EDT

[#37]

Quoted:

arent kns a no no with Geissele triggers?

They are fine to use. Geissele says he does not recommend them. He is supposed to say that...

Posted: 6/22/2013 1:26:21 PM EDT

[#38]

My MATEN (DPMS) build, not done yet. More to come...

Great thread by the way...I learned a lot from it.

Posted: 6/22/2013 1:42:32 PM EDT

[#39]

Quoted:
http://farm3.staticflickr.com/2890/9051390075_ecb11bfdaa_o.jpg

Just wondering, how good does the keyhole style rail hold the rail panels? I know I have several shelving units that use this and they suck at staying together. I've never seen one of these in personal and just thought I'd ask.

Posted: 6/22/2013 5:39:31 PM EDT

[#40]

Picked up my MKM Receiver Set today and got it all put together.

MKM Rifle length
762 Industries BCG
Mega 16" barrel
Surefire Brake
Weight: 8lbs 12oz empty

Got it out to the range as well today and ran 140 rounds of 4 different types of ammo through it and didn't have one hiccup. Very happy with the build.
I plan to cut it down to 14.5 and pin and weld the brake on and maybe recontour the barrel but it will stay as is for a little while.

Posted: 6/23/2013 12:54:08 PM EDT

[#41]

I took my new build to the range yesterday. No issues with my SSA trigger or KNS pins.

I am using a 762 bolt and Mega 18" barrel.

Upon arriving I did manually cycle a .308 cartridge and it was very "sticky"; took quite a bit of arm to get the round to cycle. I opted to do all of my test shooting with 7.62 which cycled manually with no effort. Based on some feedback from this thread - I'll put a few hundred rounds of 7.62 through before going back to .308 on the anecdotal premise that the bolt and barrel will "wear in a bit" (no idea if this is true!).

The rifle performed with no error; I'll be going over it today to see how my assembly stood up.

Posted: 6/23/2013 4:39:25 PM EDT

[#42]

Quoted:
I took my new build to the range yesterday. No issues with my SSA trigger or KNS pins.

I am using a 762 bolt and Mega 18" barrel.

Upon arriving I did manually cycle a .308 cartridge and it was very "sticky"; took quite a bit of arm to get the round to cycle. I opted to do all of my test shooting with 7.62 which cycled manually with no effort. Based on some feedback from this thread - I'll put a few hundred rounds of 7.62 through before going back to .308 on the anecdotal premise that the bolt and barrel will "wear in a bit" (no idea if this is true!).

The rifle performed with no error; I'll be going over it today to see how my assembly stood up.

Cool, thanks for the info. I don't think "wearing in" is voodoo. There's definitely plenty of places where metal will rub past each other. For me the two stickiest places are the teeth/barrel extension (with .308 cartridge or GO gauge chambered) and the cam pin. Both are already smoothing out, but will hopefully continue to do so.

Don't get me wrong, I think it's a heck of a combo and lots here seem to be using it.

Would be awesome if others could chime in with their experiences.

Thanks!
-Stooxie

Posted: 6/23/2013 8:34:14 PM EDT

[#43]

Got a little closer to complete this weekend. Waiting on GG&G Heavy Duty QD bipod and decide on optic to carry me to 1000yds+.
http://i2.photobucket.com/albums/y32/f22pwrdaccord/null_zpse5ea951e.jpg

Posted: 6/23/2013 11:48:34 PM EDT

[#44]

Agree with the wearing in. I'm running the Harris tactical BCG and the mega 20" barrel. At first I couldn't smoothly seat the bolt on an empty chamber, I had to let it slam all the way to go in. After 50 rds and 3 solid cleanings now it runs very smooth, it will seat while letting it go forward in "slow motion" by hand no issues. My first trip to the range was definitely disappointing, no ammo would cycle, 25 rds. Changed the buffer to an H-2 and the next trip ran 180 grain 308 flawlessly but not the M80 7.62 stuff. Another cleaning and a standard buffer is my plan for the weekend. The cleaning always has some brass, and other shiny metal stuff and flaky dark stuff, I definitely think it is breaking in.

Thoughts? I am by no means an expert......

Posted: 6/23/2013 11:50:44 PM EDT

[#45]

Are all of these NiB BCG's made by the same person? They seemed to all hit the market at the same time, they all have the same description, they are all in the same $10 price range, and they all look the same on closeups. I'm talking about the 762 ind, Harris tactical, and I think there are some ebay ones as well. Thoughts?

Posted: 6/24/2013 7:11:18 AM EDT

[#46]

Quoted:
Are all of these NiB BCG's made by the same person? They seemed to all hit the market at the same time, they all have the same description, they are all in the same $10 price range, and they all look the same on closeups. I'm talking about the 762 ind, Harris tactical, and I think there are some ebay ones as well. Thoughts?

I emailed Harris about that. This is what "Rob" said:

"They may purchase from the same manufacturer and looks exactly the same."

Go figure!!

762 Industries hinted that they are working on a QPQ/melonite version and we're all pushing Rubber City Armory to the the same. I think that will help because the NiB adds dimensional thickness where QPQ does not.

Can you imagine an RCA 308 BCG? What a chunk of evil that thing would be!

-Stooxie