7.62x39 upper in 20"?

Discussion in 'AR-15 Discussion' started by CpnT0rch, Nov 5, 2012.

  1. CpnT0rch

    CpnT0rch New Member

    8
    0
    0
    I didn't see any other threads for this, so I thought I'd post one. Does anyone know who, if any, makes a 7.62x39 upper assembly with a 20" barrel? I have been doing some searches and I can't seem to find any info out there. And, if I choose to build an upper, can I use a standard AR-15 upper, and just get the 7.62x39 BCG, barrel, and magazine, or is there a specific 7.62 upper that I need to get? Any help is greatly appreciated.
     
  2. BsonomaMN

    BsonomaMN New Member

    14
    0
    0
    I've been doing some searching on my own for that. below are a few links. Many receivers are marked "MULTI" instead of a particular caliber; you should be able to drop a complete x39 upper on a standard AR15 lower.

    http://www.model1sales.com/index.cfm?fuseaction=category.display&category_id=281

    18"
    http://www.rguns.net/rifles/rifles-semiauto-ar15-uppers-76239-18Inch-A3Fluted.shtml

    out of stock now, but worth keeping an eye on:
    http://www.jsesurplus.com/yhm-4-1-1-1.aspx
    or
    http://www.galatiinternational.com/product/MDB762PRC.html

    there were a few others out there that I didn't bookmark, but they're out there.
     

  3. SSGN_Doc

    SSGN_Doc Well-Known Member

    6,927
    67
    48
    I'm not sure about a 20" barrel, but a standard upper works. Different bolt and mags are what you need. The mag is the weak link on a 7.62x39 AR. The round really needs a curved mag to feed well. The AR mag well is straight at the top and most folks experience feed problems. RRA introduced a different lower that uses actual AK type mags to alleviate this problem, but then that lower doesn't work with all the other calibers a standard AR would have as options because it won't take any if the AR mags.

    Not to burst your bubble or discourage you, just letting you know that there may be some frustration ahead of you in this build.
     
  4. BsonomaMN

    BsonomaMN New Member

    14
    0
    0
    It seems that this one is debatable. On a lot of other forums its about a 1:1 ration of people who say it doesn't work to those who say theirs works great with out any hiccups. I'm convinced enough by those who enjoy their set-ups that I'm going to give it a shot. From what I've been reading it sounds like the key is to make sure you get the right brand of
    mag.
     
  5. CpnT0rch

    CpnT0rch New Member

    8
    0
    0
    Thanks for the help guys. I have yet to find a longer barrel, but I have come across the curved mags. BCG completes and parts seem easy enough to come by, but the barrels are another story. I don't even think I've found any in 18". When I get some extra time I'll update with links to the parts that I've found so far.
     
  6. LeoGripster

    LeoGripster New Member

    22
    0
    0
    You should be able to get a 20" from here:

    http://jtdistributing.net

    The link might be bad, but google JT distributing and you'll find it. You'll love the 20" setup. You'll need to buy a longer/stronger firing pin if you use steel cased ammo. There are numerous places to purchase mags too:

    http://www.surplusammo.com/ammuniti...15-7-62x39-10-round-stainless-steel-magazine/ 16.99

    http://www.mwgco.com/ar-15_accessories/product/MWG-762-005.html 14.90

    http://www.cheaperthandirt.com/2MGASC76230RDSS-1.html 17.79
     
  7. LeoGripster

    LeoGripster New Member

    22
    0
    0
    Oh, and once you buy it, don't tell anyone. The 7.62x39 AR is the best kept secret around. Cheap ammo, more power than 5.56, and the list goes on. Since it isn't a traditional AR, it get bashed quite a bit by fanboys.
     
  8. CpnT0rch

    CpnT0rch New Member

    8
    0
    0
    Awesome! I will definitely use those resources. why do I need to get a longer/stronger firing pin for steel casings?
     
  9. Jpyle

    Jpyle New Member

    4,828
    0
    0
    If 7.62mm is what you are looking for take a look at .300 Blackout...it's a 7.62 x 35 round currently in use by the military and all standard AR mags and BCGs can be used...only change needed is barrel. It's a walloping 125gr round with full load 2200+ fps velocity and subsonic variant. Not as cheap as 7.62 x 39 but not too unreasonable at about $12 for 20 rounds...not sure what bulk pricing is at the moment.

    [ame]http://www.youtube.com/watch?v=Sd_2tcj7P4s[/ame]
     
  10. BsonomaMN

    BsonomaMN New Member

    14
    0
    0
    Do you have any Source for 20" barrels or uppers for the 300blk? I've looked all over and have been striking out.
     
  11. Jpyle

    Jpyle New Member

    4,828
    0
    0
    I am looking for the same type of barrel. I'll let you know what I find.
     
  12. msup752

    msup752 New Member

    562
    0
    0
    There is little to no benefit to longer barrels in 300 Blackout. It uses fast burning powders which are ideal for short barrels and suppression.
     
  13. AgentTikki

    AgentTikki New Member

    3,496
    0
    0
    Along the same lines i wonder if the 7.62x39 runs out of gas with longer barrels.

    I dont think ive ever seen a 20" ak or sks barrel....
     
  14. BsonomaMN

    BsonomaMN New Member

    14
    0
    0
    Great! I hope you have better luck then I did! :D
     
  15. BsonomaMN

    BsonomaMN New Member

    14
    0
    0
    You are correct that the round was developed with the M4 as it's primary weapon in mind; I'm not sure you'd see a sever performance decrease from adding 4 inches (I'm not saying this as a matter of fact of course) to the barrel. Also, I know the accuracy gains would be minimal, if existent at all. For me it s just a matter of preference.
     
  16. SSGN_Doc

    SSGN_Doc Well-Known Member

    6,927
    67
    48
    The SKS has a 20" barrel.
     
  17. AgentTikki

    AgentTikki New Member

    3,496
    0
    0
    I stand corrected! :eek:
     
  18. CpnT0rch

    CpnT0rch New Member

    8
    0
    0
    I've heard some awesome things about the blackout lately and I'm gonna have to check that out as well. I had a chance to put a round in my hand and that is really cool without a doubt. From what I've seen, the ammo is a bit more, but not enough to completely rule it out. I'll have to do some more research on it in comparison to the 7.62x39 to make an honest decision... Or maybe I just need to have both... Lol
     
  19. msup752

    msup752 New Member

    562
    0
    0
    Yep, get both. I do. But I rarely shoot my AK variant but am always out of ammo for my 300 BO. I need to get more money and load faster!
    I just put a Vortex Strikefire on it to supplement the irons so I now MUST take it back out to the range. PSA had the Strikefire sights for $119 and I couldn't pass that up although an aim point is my future goal.