Building first AR15
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Old 01-27-2014, 09:33 AM   #1
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Default Building first AR15

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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Old 01-27-2014, 01:52 PM   #2
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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

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Old 01-27-2014, 02:50 PM   #3
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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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Old 01-27-2014, 03:25 PM   #4
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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.

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Old 01-27-2014, 04:03 PM   #5
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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.

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Old 01-27-2014, 04:25 PM   #6
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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

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Old 01-27-2014, 04:53 PM   #7
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Yeah I'm gonna with a 6.8 AR pistol instead

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Old 01-27-2014, 08:53 PM   #8
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Quote:
Originally Posted by Ruger22lr View Post
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.
Blackhole makes a good barrel.

http://www.blackholeweaponry.com/catalog/index.php?cPath=24&osCsid=ebb85612cd2d9a97b1b224b0 04edcf62

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..
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Old 01-28-2014, 12:59 AM   #9
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Quote:
Originally Posted by Ruger22lr View Post
Yeah I'm gonna with a 6.8 AR pistol instead

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
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Old 01-29-2014, 01:15 AM   #10
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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...

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