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Posted: 7/23/2014 10:08:38 PM EDT
[#1]
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Posted: 7/24/2014 6:01:39 PM EDT
[#2]
Will that round burn most of the powder in that short of a barrel? I am going to build a pistol and was going with a 10.5 in 5.56. I could change my mind.
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Posted: 7/24/2014 6:28:07 PM EDT
[#3]
I'm not a doctor or anything but I think 7.62x39 out of a 7.5" barrel will have about the same muzzle energy as 5.56 out of a 10.5" barrel.
I based that off of the muzzle energy graph from ballistics by the inch for .223 caliber 55gr bullets out of a 10.5" barrel compared to the 124gr .357 magnum bullet out of a 7.5" barrel graph. I know that is in no way scientific by any means, just an educated guess. Someone please correct me if I'm way off. |
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Posted: 7/24/2014 9:27:20 PM EDT
[#4]
with the KAK 8.0 inch pistol gas guys are reporting 2100 fps with the red army 123 grain so that's going to be more more than 556 i would imagine
not a 7.5 but pretty close |
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Posted: 7/24/2014 10:29:01 PM EDT
[#5]
Thanks for those links... last one looks the best, but are there any standard A2 style uppers, like the dpms kittykat?
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Posted: 7/25/2014 12:23:06 PM EDT
[#6]
I'm not aware of any in 7.62x39 but you could definitely build one
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Posted: 7/26/2014 5:14:08 PM EDT
[#7]
I have one of these: runs like a top from day 1
http://shop.redxarms.com/75-RXA15-762-X-39-SS-UPPER-ASSEMBLY-75762x39UH.htm |
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Posted: 7/26/2014 7:57:29 PM EDT
[#8]
I have an 11.5" YHM barrel. Carbine gas, and works well. I have ASC mags, and they work fine. I am going to try the new style C products and see how it does this week. I will chrono several different steel cased ammo, from 122gr to 154 gr.
It has 1/2x36 threads, that limits muzzle devices, but there are several to choose from. I have a troy 9" rail, I guess being an old fart, I prefer a little barrel showing. sorry for the crappy phone pic 
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Posted: 7/26/2014 7:59:07 PM EDT
[#9]
Sota
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Posted: 7/28/2014 5:49:14 AM EDT
[#10]
I got my 7.62x39 16"er from this guy......
http://www.armslist.com/posts/3067967/alabama-rifles-for-sale--ar-15-service-16--5-56-or-7-62x39-option-complete-upper-half-ar15-1-8--twist--tactical-entry-556-10-5-sbr--ar-15 over 2500 round shooting steel case cheep ammo..... no problems........... 
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