Building first AR15

Discussion in 'AR-15 Discussion' started by Ruger22lr, Jan 27, 2014.

  1. Ruger22lr

    Ruger22lr New Member

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    Well I am building my first AR15 and it's going to be a 7.62x39 pistol or 6.8 pistol. I already have the parts ordered now I just need to know the tools I will need. Also for the other complete lower I will be getting a .50 beowulf upper for it.

    The lowers are a PSA lower receiver with Dark Earth MOE furniture and a Andrews AM15 stripped lower.

    http://www.vcdefense.com/7-7-62x39-ar15-pistol-upper-complete-free-float-quad-rail/

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    Last edited: Jan 27, 2014
  2. Sniper03

    Sniper03 Supporting Member Supporter

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    Ruger,

    The 7.62X39s are OK if you can get everything set up correctly. Otherwise they have been known to have mag issues. I know the ammo is more plentiful but I think I would possibly go with the 6.8 or standard 223/5.56 if you are going to shoot it a lot.
    On the other issue you may want to seriously consider going with the 458 SOCOM so you are not stuck in the proprietary ammunition situation $$$$$$ and the ballistics are great on that round being a big cal? 458s are more readily available and easy to load.

    03
     

  3. Copeman60

    Copeman60 New Member

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    Most people stick with 556 for there first build. What our your reasonings for wanting a 762x39 or 6.8 in a pistol form??

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  4. dwmiller

    dwmiller Well-Known Member

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    Welcome to the AR family. 7.62x39 has issues and feed problems as noted above. It also looses a lot of its effective energy in short pistol barrels. Same problem with 556 , just not enough velocity from the short barrel. Lots of shooters call it a p%&*d off 22lr out of the pistol.

    The 6.8 shines in 12-14.5 " barrels. That's what it was designed for. I haven't seen any data on it from a 7-10" pistol barrel though. I have a 6.8 in a 16" mid length and it outperforms the 556 in all categorys. Better energy, flatter ballistics, and longer effective range. Just note its not a cheap cartridge to shoot, ~.80 - 1.00 a round. Mine was built for a superior rifle for hogs in brush. Hope this helps.
     
    Last edited: Jan 27, 2014
  5. Ruger22lr

    Ruger22lr New Member

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    Yeah I figured 6.8 would be better and .80 per round doesn't sound too bad. So where can I get some pistol length 6.8's at? Yeah I want one because I don't to have to apply for a tax stamp but want a short barreled .30 cal AR. I know .50 beowulf is more expensive but it's what I've been wanting for a while now.
     
  6. purehavoc

    purehavoc New Member

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    I have a couple 7.62X39 uppers one is a 9.75" barrel the other is a 16" when it warms up above 30 deg I plan on getting them both out for some chronograph time with the same ammo . I can tell you that the sweet spot on a 7.62 x39 is in that 12" length . There is not that much velocity lost between a 10" and 16" barrel in the 7.62X39 unlike the 5.56 . where there is lots and lots of velocity lost with that round in a short barrel . If I remember correctly it is less than 400 fps difference with the 7.62x39 . I would need to go back and check some of my notes and double check that to verify though .
    Feeding these beasts .
    My 16" feeds just fine my 9.75" had some major feeding issues going on with this build . Lots of regrinding and polishing the feed ramps to make it feed reliably , minor mag modifications to work reliably with this gun . I only suggest ASC mags to feed the 7.62x39 with anything else is just unreliable and I wont say that all of these will work 100% . I have had to modify the feed lips on one of the mags I purchased to make it feed correctly . all the rest of them I own feed fine . Its kind of a crap shoot but it is a fun gun once you get one running properly .
    Now keep in mind I am a AR guy at heart but If you want my honest opinion and want to go 7.62x39 buy a AK , they are more reliable than the 7.62x39 AR , mags are readily available and cheap . They are the simplest design that I know of and they just plain work !!!!!
    Good luck my friend
     
  7. Ruger22lr

    Ruger22lr New Member

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    Yeah I'm gonna with a 6.8 AR pistol instead
     
  8. dwmiller

    dwmiller Well-Known Member

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    Blackhole makes a good barrel.

    http://www.blackholeweaponry.com/catalog/index.php?cPath=24&osCsid=ebb85612cd2d9a97b1b224b004edcf62

    They don't list one that short, but they do a lot of custom work. Shouldn't be a problem to get them to make one. They do list 7.5" and 9.5" in 556 so they know pistols.. ;)
     
    Last edited: Jan 27, 2014
  9. TexasGunner

    TexasGunner New Member

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    If you want a .30 cal pistol, go with a 300 blackout. Easy easy easy to load ammo. The powder is almost completely burned in first 8" of barrel. I just built one with an 8" barrel with a flaming pig. Shot it this weekend..... Oh my damn! That thing is awesome! ImageUploadedByFirearms Talk1390870697.606561.jpg
     
  10. dwmiller

    dwmiller Well-Known Member

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    Got to agree. 300 blk is a great round for what you want to do. Stock BCG and standard AR mags are a big bonus...
     
  11. Squawk

    Squawk New Member

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    Make sure that "pistol" upper never makes it onto that "rifle" lower. Federal crime if caught with it and then you won't be able to own any guns

    And as everyone else said, go with the 300BLK.
     
  12. sweeper22

    sweeper22 New Member

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    I'm not about to tell you what you should do with your money. All I'll offer is what I feel works for me. Just an opinion.

    6.8spc is a good round round, but I feel its been rendered somewhat obsolete by the emergence of 300blk.

    If I buy a 7.62x39 or 5.45x39, it'll be in an ultra reliable 'shoots anything you cram into it' AK format. And if my budget allows, it'll be an Arsenal AK.

    300blk offers similar ballistics to an AK47 (7.62x39) in terms of supersonic 125gr type bullets, but is more precise. The result of it being more precise is because its less sloppy...which generally equates to less forgiving tolerances in terms or jamming cheap steel-cased ball ammo through it. So that knife cuts both ways depending on your preferences...precision vs reliability with cheap ammo.

    The benefit of 300blk is that its supersonic rounds are generally more precise (but less able to digest the cheap stuff) than AK's, while also benefitting from the versatility of a suppressed subsonic round.

    300blk is really versatile. Whether or not that works for you depends on whether you're willing to spend the $1000 and 9-month wait (NFA suppressor) it takes to reap those rewards.
     
    Last edited: Jan 30, 2014
  13. Sgt_Skrb_25

    Sgt_Skrb_25 New Member

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    I have a 7.5" 5.56 pistol, and a 16" 7.62x39 AR. One thing to think about on pistols would be cycling, it took some work to get the pistol gas system to balance out right. I tell people to go with 10" barrels because they can run a carbine length gas system on that. The may save a lot of headaches. As for the 7.62x39, the trick is mags. I have overcame that issue with frankenmags. I have put a crap load of ammo through them with out one feeding issue. It's a 5.56 upper mag welded on a AK mag ,with AK spring and folower. I have tried to jam this up and it will not. ImageUploadedByFirearms Talk1391181689.339458.jpg ImageUploadedByFirearms Talk1391181700.286004.jpg


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  14. dwmiller

    dwmiller Well-Known Member

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    I have to disagree with this. 300 blk is a superior round out to 200 yds, after that it doesn't compare with the flat ballistics and retained energy levels of 6.8.

    Its main use is the subsonic suppressed round for CQB. At longer ranges it requires extreme hold overs with the heavy subsonic
    bullets. And with light bullets is cannot be used suppressed. It does have a wide range of bullet weights. This changes the holdover substantially for different loads.

    6.8 excels at ranges to 500 yards and provides higher energy levels than 5.56 at the same ranges. It is designed to match the current military AR M4 performance envelope with increased terminal ballistics compared to 556. It is designed for a narrow range of bullet weights. One hold over curve works pretty well for all bullets.

    If you need more range look at 6.5 grendle, just be aware it requires a long barrel to get its higher velocity and longer range. I've seen it claimed as a 1000 yd AR. :rolleyes:

    Different rounds designed for different purposes. Less than 200 yards negligable difference, 200+ and the 6.8 is better. For the record I'd probably go with 300 blk for a pistol... ;) let the flame begin....

    PS love the frankenmag above! Are you planning on making any more?
     
    Last edited: Jan 31, 2014
  15. Ruger22lr

    Ruger22lr New Member

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    I am getting a pre-built 6.8 upper for the pistol. Also got it built here's the pics.

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