7.62x39 On AR15 Platform

suzukiray · March 25, 2015

My newest build & gathering parts. Have the upper, 80% lower & NiB bcg already for it. The followers to fix the 223 mags are on the way, as is my barrel. What muzzle brake would you guys use for a 1/2-28 on this barrel? Does someone make it or do I need to stick one of the 223 bakes in the lathe?

Ray.

Dane Armory · March 25, 2015

Ray I have 9 of these brakes left

1/2 x 28tpi. 30 cal. For $25 plus $2 shipping

Here is a couple pics with 7.62 x39R in it.

shepp · March 25, 2015

I planned out a build for a pistol in x39, I found some searching thru Google think they were made buy YHM

Robocop1051 · March 26, 2015

I've made a handful of these. I even have most of one on my desk now... no bolt yet... not till I complete a pistol lower.

YHM makes a great barrel. It's affordable and 2 MOA. One of the tricks is to stay with carbine gas.

PWS makes great muzzle devices. I used their FSC30 on my last build. I have a Krink style for my current build.

Robocop1051 · March 26, 2015

Make sure you get a 7.62x39 firing pin... it's slightly longer for those pesky soviet rounds.

shepp · March 26, 2015

Make sure you get a 7.62x39 firing pin... it's slightly longer for those pesky soviet rounds.

I believe this is the one you recommend robo???

https://www.mgi-military.com/store/index.php?product_id=48

Check out this:

And this:

Edited March 26, 2015 by shepp

Robocop1051 · March 26, 2015

Damn Shepp, you're on the mark.

I do recommend MGI, based on personal use.

I also recommend Cason Engineering, based on their vastly increasing popularity and reputation solely from their 7.62x39 bolt.

Both bolts come with a 7.62x39 firing pin.

shepp · March 26, 2015

Damn Shepp, you're on the mark.
I do recommend MGI, based on personal use.
I also recommend Cason Engineering, based on their vastly increasing popularity and reputation solely from their 7.62x39 bolt.
Both bolts come with a 7.62x39 firing pin.

I did my homework, and book marked a bunch of poop I'm hoping to start on it after I get back from AZ granted they don't strong arm me into somthing down there

PS I read both those threads a few times helped me decide to do this.

Edited March 26, 2015 by shepp

Robocop1051 · March 26, 2015

The next "upgrade" I'm thinking about is a HiperFire trigger. I think the extra hammer force will be a positive for igniting those extra thick soviet primers.

The items that require the most attention when making a 7.62x39 build are:

• Low pressure from all the ammo you're likely to buy. Much lower than the NATO round. There is good stuff out there, but let's be honest here... you are building this to shoot cheap Wolf/Tula ammo. The shorter the gas system the better. If it requires regulating, then maybe invest in an adj-GB later.

• Don't kill your budget on a barrel. The cheapo surplus round is not a precision cartridge, so you'll never get the round to perform as well as the barrel. You'll end up burning up that expensive barrel using all that steel cased ammo. Honestly, if I'm shooting sub-6 MOA I'm happy.

• Bolts... buy 3 for $50 ea or buy 1 for $125... this part is the Achilles heal of rifle.

• case taper is SIGNIFICANT in comparison to the NATO round. Picking a magazine can be tricky. The *new* C-Products Defense "J-Mag" has my vote... unless you can find a lower that accepts AK mags.

• the 7.62x39 surplus ammo has thick, recessed, primers. A heavier hammer and/or hammer spring will be a bonus. This is also why the "enhanced firing pin" is a huge bonus as well.

• think dirty! The cheaper the ammo the dirtier it gets. NiB or Melonite are your friends for the more exposed parts. I used to suggest a (YHM) CMV chrome lined barrel, but a nitride bbl works too. My current build has a cheapo Melonite barrel and an Adams Arms piston kit. This was about as clean as I could make it.

suzukiray · March 26, 2015

I have a 16" chrome lined barrel on the way & got a 125 dollar NiB bcg with the correct firing pin in it for this. I was told the P mags will work if I change the base plate/follower in it? Going to try the Elftman AR10 trigger to see if the heavier hammer will make it fire those primers.

Ray.

Edited March 26, 2015 by suzukiray

suzukiray · March 26, 2015

Robocop, I just went & read thru your thread on the build you did as a pistol. Great info, thanks for the link to it.

Ray.

shepp · March 26, 2015

Hiperfire is on my list of to buys

Although someone did say he liked his new elfman trigger better.....

Edited March 26, 2015 by shepp

Robocop1051 · March 26, 2015

Robocop, I just went & read thru your thread on the build you did as a pistol. Great info, thanks for the link to it.
Ray.

It's still technically a "work in progress". I grabbed a VLTOR CASV-M recently. The upper is still in parts. If I get the chance this week, I'll start installing the parts.

washguy · March 26, 2015

And you need some 40 rd Franken mags from the 90's mine feed like a champ :) Wash

Robocop1051 · March 26, 2015

I actually got to talk to the people who bought CProducts, now named CProducts Defense.

They built a new 28rd mag, designed to fit in standard m4 pouches. Part of this new design included a new spring and anti-tilt follower. They state that the new spring and follower, when used in their standard 30 rnd body (7.62x39 Jmag), actually fit 35 rounds.

dprice38444 · April 2, 2015

makes ar-15 lowers that accept ak-47 mags

Ordering Information

Contact us for more information or to place an order.

For Info: info@michaelsmachines.com

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Dealers send FFL to:

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Edwardsville, IL 62025 Home | Information | Pricing | Pictures

makes

NTXshooter · April 11, 2015

What's the best buffer for a 7.62x39 AR?

washguy · April 11, 2015

What's the best buffer for a 7.62x39 AR?

I use plain ol ar 15 buffers in mine. :) Wash

Robocop1051 · April 12, 2015

Ditto

NTXshooter · April 12, 2015

Thanks, I thought with the larger round, it might take a heavier buffer.

GRA · May 17, 2015

What's the best buffer for a 7.62x39 AR?

Using a generic AR15 buffer in mine. It works fine as it is.

tbready · May 27, 2015

What's the best buffer for a 7.62x39 AR?

Depends on the gas port size. Both of my x39 builds (16" ARP and 7.5" Tactical Ammunition barrels) run red Sprinco springs and H2 buffers

Edited May 27, 2015 by tbready

GRA · May 27, 2015

Thanks for the information and specifics. I'll keep that in mind.

On another positive note ...

I spoke with one of the Techs today over at LCJ Wholesale ...

:banana: C-Products Defense NEW 28-round J-Mags are IN !!! :banana:

He's already shipped some of them out. I bought the last 5 he had on hand today and he's expecting 100+ more in by the end of the week when they get back from the coating shop.

He stated they have not had these very long at all and cannot keep them in. Drop them a line and get on the ordering.

Had a long talk with him and he explained what they've done with reference to springs and the followers and why the 28 rounders and the Gen II 30 rounders are working out. He stated the 28 rounders have been very carefully engineered as opposed to mags in the past and these will fit in an M16 mag pouch, roughly being the same size as the 30-round 5.56 mags.

He also stated the AR15 buffer and buffer spring should run just fine. He stated the only other thing that folks seem to be having problems with is they need a 7.62x39-specific bolt or at least the caliber-specific firing pin.

Regardless ... I just thought I'd put that out there because I know some folks on here were waiting on these new mags. :))

tbready · May 28, 2015

Chad at CPD has been giving us the ole "they'll be shipping next week" for like 6 months now with these mags. I can't wait to get some of these new 28 rounders. Finally.