Thinking about piecing together a 7.62x39 upper for my SBR. Need to save on ammo costs. Should do same job as the .300 Blackout with supers.
Who makes a good BCG for the x39? I’d like one of the coated, easy to clean ones, and one that can handle steel case ammo as well. Have a chrome BCG in both my .300 Blackout, and my 5.56, and I love them. Temped to sell my .300 barrel, and just get a x39 bolt for my chrome carrier. Thinking KaK, as I’m pretty sure I’m going with their 11" barrel. Also, anybody have any info on if it’s worth it to pay the premium for the cold hammer forged barrel over the value line barrel? This will just be a defensive gun for 200 yds and in. I’m thinking Value line.
I’ve got over 3k rounds through one of my 20 round CProducts mags and close to 1k on a 10 rounder. Same springs it’s hilarious I almost want to break one just to see if it will. PWS Mk116 suppressed an absolute hog and coyote slaying machine for 19 cents/shot can’t complain.
i have both the KAK Value Line 16", and their premium 16" CHF barrel in 7.62x39. bought them as 16". sent them out to be shortened, crowned and threaded to 14.5" and pin/weld the brake. I used the KAK VL for my experimental piston conversion, and the CHF barrel for an 7.62x39 M4gery. they are good barrels, but seriously overgassed, even after being shortened to 14.5", even with H3 buffer. the gas port as delivered for my barrels was 0.096". should probably be around 0.070 or 0.067" for DI. so an adjustable gas block is needed. they are true 0.311" bore. I like them. bought a couple more VL’s for future builds when they were on sale for $100, but you have to throttle the gas flow (SLR adj GB or BRT).
I have no experience with any 11" 7.62x39 barrels.
I use AIM Surplus BCG’s for my 7.62x39 builds, nitride or NiB, depending.
While I don’t consider myself to be a professional gunsmith I did tutor under one for a year and put myself through school building various forms of AR-15’s (The Correct Way)
I recently put a 7.62x39 AR15 upper together for hog hunting as I did not want the 300 BLK or an AR-10 platform. I tested it out the other day and found it to function and work flawlessly. The ammo was Monarch and Tula steel cased. The Monarch worked great and the Tula only worked about 90% percent of the time, I think I got a bad lot. I’ll just stick to Monarch in the future. Looking forward to trying Wolf and Brown Bear if I can get it.
I saw a lot of guys are having trouble with this type of assembly as the AR15 platform was never meant for this round. If you want email me at Robar90@yahoo.com and I’m glad to help out or provide the list of materials I used on mine.
Quite possibly, the bolt for the CMMG Mutant. It’s designed with a larger diameter bolt and stronger locking lugs. I don’t think the Mutant bolt is compatible with the standard AR carrier or receivers.
From what I understand, for best function, you want a lower designed to take AK mags. PSA offers lower that take AK mags, bolts made to work with AK mags and uppers, but I don’t know if the PSA is based on the Mutant pattern or not.
PSA KS-47 is NOT a Mutant.
the Mutant is proprietary, using an AR-10 bolt.
The KS-47 is AR-15 sized with a std. AR-15 7.62x39 bolt and a custom cut carrier for AK mags.
PSA calls it a hybrid and is the same carrier they now put in their 7.62x39 ARs that run AR type mags as well.
I don’t have any reliability issues with my CPD 7.62x39 AR mags but if you prefer AK Mags the PSA looks like a good option. My 16” 7.62x39 AR upper is an older PSA before they made the KS-47 AK mag carbine. It’s a good shooter and reliable with Wolf, Brown Bear, Golden Tiger, RAS and Surplus Yugo M67.
Just watched a couple reviews on the PSA KS-47, and it seems to perform reliably. Despite a lot of people slamming PSA, I got one of their pistol lowers a while back so I could easier travel with my .300 Blackout SBR, and zero issues. Then I recently went and picked up a 10.5 5.56 pistol uppers as well, same thing.
I have a Windham Weaponry SRC in 7.62x39. The only issue that I’ve ever had with it is some light primer strikes due to hard primers. It turns out that the ammo was made in a Ukrainian factory that has since been destroyed by the Russians. Other than that, no issues. I also “built” a 7.62x39 AR15 by combining a Bear Creek Arsenal upper with a Tactical Machining 7.62x39 marked lower that I assembled. The finish matches perfect and it runs 100% as well. I use D&H magazines and RZE Unimags. The RZE Unimags are shaped like regular magazine, but feed 7.62x39 just fine. Here’s a magazine review video and me shooting my Windham Weaponry SRC upper on a M16A1 lower. https://www.youtube.com/watch?v=ma82EphaORQ&t=1s
Personally, I wouldn’t spend out the nose on a 7.62x39 AR15 build. The inexpensive stuff runs and if it breaks or wears out, you can buy inexpensive replacement parts. When/if my barrels wear out, I’ll just replace them. That’s the beauty of the AR-15. BTW, the Windham Weaponry cost me $550 and the total build cost of the Tactical Machining/Bear Creek Arsenal was around $400.
Maybe the strongest bolt still being sold individually that will fit a mil spec extension but not as strong as the Superbolt, no where near the Titan, 750XD or 800 series. Not near as strong as CMMGs Anvil either. I believe in the photo is a mil spec 5.56 and 6.8 then a Grendel Titan, 750xd and on the rt is the 800 series.
Seriously? Have you seen all the other cartridges an AR can feed and shoot well? I have had zero problems with mine with the right mag. Felt recoil is a lot less than with a AK. And they are very “tuneable.” You are pimping a 60+ year old design. Times change. To get a decent AK nowadays you are at $1100+ and still no last round bolt hold open. Lots of success stories out there. Welcome to 2019.
So my SKS is a turd and can’t be used with 7.62x39?
Well I have a couple of both, ARs & AKs in 7.62x39.
Both are reliable. I like AKs but there’s way more aftermarket goodies for ARs, and It’s easier to mount optics.
If you shoot out an AR barrel, it’s simple to replace.
Break a bolt? You can swap out a bolt pretty quickly with no special tools.
Most 7.62x39 uppers run fine on std. lowers too. $300 will get you a decent budget upper and a few mags if you already have a 5.56 AR.
Just my preference. I can change AR mags faster than I can rock n lock an AK mag, and LRHO is nice.
I tried some BHO AK mags, not the same, they let the bolt close on mag changes so I don’t see an advantage. I even cut out my safety on my WASR to hold the bolt open but it’s another step.
If you do find you’re not getting reliable ignition and you’re already running an enhanced firing pin, then the next step is more hammer force. Like a Wolff xtra power hammer spring. In a single stage trigger that makes for a heavy trigger pull, but if that does fix your ignition problem, then bump up to an inexpensive 2 stage trigger. I run a RRA 2 stage with an xtra power spring in my AR pistol, a light pull and touches off everything.
If you want a nicer trigger than that, I put a Hiperfire 24e in my carbine lower, which shares a 5.45x39 upper too. Use the std. weight spring instead of the light spring it comes with, that touches off any commercial or surplus 7.62x39 or 5.45x39.
