Pennsylvania Firearm Owners Association
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  1. #1
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    Default 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    I figured I'd just start a thread to keep the clutter out of the "deals" thread.

    I think want to build an AR15 pistol chambered in 7.62x39.

    Some random background info to help understand what I want to do:
    (although what I want could change, based on input received)

    The bolded points are not up for discussion - I will not be changing my mind on these points
    - I will NOT SBR anything. Period. Not happening. Ever.
    If pistol braces one day become verboten, "oh well" - I'm still not SBRing anything.
    - I will not be adding a suppressor. Ever.
    - No, what I "really want" is NOT 300 Blackout - I am not adding a new caliber - especially a useless (for my purposes) one that costs more.
    - I'm open to other calibers, but not 9mm - I can get an Extar instead - and nothing that requires a dedicated lower - I already have a standard lower that will be used for this and will not buy another one. (.45ACP would be awesome, but I doubt it's an affordable choice)

    - I prefer shorter barrels to longer - I won't rule out a 10.5" though since my need for a SHORT AR has been met with my 7.5" 5.56 build

    - The "intended purpose/use"? Short range self defense/SHTF - I won't use it for a truck gun due to possible bullshit that could ensue from law enforcement who do not know the law.

    - Although I'm on a budget, I may consider a SB-Tactical SBA3 adjustable brace.
    I'm perfectly happy with the much less expensive Shockwave Blade I have on my 5.56 pistol, but wonder if the 7.62x39 would be harsher on the shoulder to shoot? (there isn't much difference in felt recoil on my 7.62 carbine vs 5.56)

    - AR15s I already own:
    5.56 carbine(s)
    5.56 7.5" pistol
    7.62x39 carbine
    9mm carbine

    I'm not an AR15 novice any more, but I still could use some pointers regarding "barrel length" (is there an "ideal" length in terms of reliability?) and I'm not sure what buffer requirements there may be in terms of pistol vs carbine.

    I'm sure I'll have more questions and may need to give more info, but that's a pretty good start.

    Anyone have a 7.62x39 pistol? Good idea, or not?

  2. #2
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    First of all, I'm trying to determine what length barrel to use.

    I've seen a really short 4.5" and more commonly 7-7.5" or 10-10.5".

    I'm told that "short" isn't as detrimental to performance as it is with 5.56, but any info in that regard would be helpful.
    Not sure of a 4" barrel would be too damned short to even hold onto - there isn't much real estate on my 7.5" AR pistol.


    Also, any suggestions on where to find an affordable barrel are appreciated.
    Prefer to keep it under $100, but willing to consider slightly more.

    I'm not looking for "budget gun" so much as an "affordable" one.
    I try to buy "middle of the road" in terms of quality/price when I'm able.

  3. #3
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    A 4 inch barrel would just be for the gee-wiz factor, I would hazard a guess it would probably take some tinkering to get it to run correctly. x39 also keeps most of it's velocity in an 8" krink barrel. The heizer derringer in 7.62x39 with a 3.8 inch (ported) barrel is only supposed to be around 1,200 fps.

  4. #4
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    7.5" will do what you want. I run a h3 buffer in mine, recoil isn't bad at all but you will want a linear comp to me its louder than 556 in the same barrel

  5. #5
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    Quote Originally Posted by USMC3531 View Post
    7.5" will do what you want. I run a h3 buffer in mine, recoil isn't bad at all but you will want a linear comp to me its louder than 556 in the same barrel
    Meh. I'm not some pussy that needs a suppressor - I can handle it.



    That's something to consider. Hadn't really thought about a linear comp and that was a factor when I built my 5.56 pistol. Actually, I was more concerned with flash mitigation than sound direction, because I didn't want fireballs.

    Choice of muzzle device may factor into what barrel length I go with.

    Do you get more fireball with a shorter barrel? I would assume so.
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  6. #6
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    Is an adjustable gas block something I should consider, or will a standard gas block be fine?
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  7. #7
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    KAK has a $100 8" barrel.
    https://www.kakindustry.com/ar-15-pa...elonite-barrel

    1/9.5" twist (1/10 seems to be most common)
    I like that it's not an H-BAR (heavy barrel) too.


    They also have an 11" for $100
    https://www.kakindustry.com/review/p...tegory/75/?p=2
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  8. #8
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    Yes you get a ton of flash with shorter barrel aks, that's why I built the 3" one. I run bear creek barrels in my < 100yd guns with acceptable accuracy. The only issue I've had was light strikes and that's not a barrel issue.

  9. #9
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    Quote Originally Posted by USMC3531 View Post
    Yes you get a ton of flash with shorter barrel aks, that's why I built the 3" one. I run bear creek barrels in my < 100yd guns with acceptable accuracy. The only issue I've had was light strikes and that's not a barrel issue.
    LOL! I forgot about you building that stubby thing to create MORE fireballs.
    Yeah, I probably shouldn't be too concerned with getting spendy on a barrel for a gun I likely won't shoot past 50 yards. Perhaps a budget line of barrel would work fine.

    I used an APOC Armory BCG in my carbine. When I first got it, it wouldn't detonate some ammo. I contacted the mfg and they suspected that I got an older unit from before they switched to the extended firing pin. They mailed out an extended FP, and no problems since.
    I called to check my ZIP CODE!....DY-NO-MITE!!!

  10. #10
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    Default Re: 7.62x39 AR15 Pistol - Add Your Input for an Affordable Build

    Quote Originally Posted by Emptymag View Post
    KAK has a $100 8" barrel.
    https://www.kakindustry.com/ar-15-pa...elonite-barrel

    1/9.5" twist (1/10 seems to be most common)
    I like that it's not an H-BAR (heavy barrel) too.


    They also have an 11" for $100
    https://www.kakindustry.com/review/p...tegory/75/?p=2
    I haven’t messed around with anything (including 7.62x39) in a few years. I haven’t even bought any parts since early 2016. That said, I do own some 16” x39 KAK barrels. While I haven’t tried them yet, I can say they hog out the gas ports in their value line barrels. I’d say to the extent that I may not use them. Limiting extra violence to the action will help the bolt last longer. You could probably locate a Faxon barrel on sale for sub $150 from a few websites.

    Side note: KAK isn’t the worst oversized gas port size barrel I own. I have an unmarked 7.5” x39 I got from Tactical Ammunition back when I started messing around with shorties. That gas port is even bigger. If I recall, it’s bigger than the max reccomendation for 300BLK. Waste of $150.

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