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Last edited by Iraqgunz; 05-12-09 at 16:34.
Owner/Instructor at Semper Paratus Arms
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Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
The Air Force reconfigured all it's M16's to "A2ish". They changed FCG's stocks and uppers. The only unconverted lowers I personally haven't seen are the GUU/GAU guns.
S/F
Al
"Hold on to your hate, it helps you stay focused"
How did the barrel twist work between the M16 and M16A1 was one 1-14 and the other 1-12 or do I have this all wrong?
both were 1/12 as far as I know. I remember going to the range in '83 or '84 and trying to qualify slinging M855 down range (we were one of the last in the Brigade to give up our A1's). It didn't go well at all.
early Model 601 (AR15) had 1/14 twist IIRC...
604 (M16) and 603 (M16A1) both have 1/12.
as for 1/14 vs 1/12, here is what Ekie from TOS wrote about it:
While the standard 1/14 .224 barrel twist was quite successful in commercial firearms it did not serve the AR-15 well. M193 ammunition utilizes a boat tail projectile rather then the more common flat base. Boat tail bullets have less bearing surface to engage the rifling of the bore then flat base bullets of the same weight. The result was that the 55 grain FMJBT bullets were on the edge of stability when fired from the AR-15. Accuracy testing conducted by the US Army, US Air Force, and the NRA showed unacceptable accuracy with the 1/14 twist. Because of these factors a twist change to 1/12 was approved on July 26th, 1963.
*** Damn Proud to Be an American Ally ! ***
The Armory:
Colt 6601 - Colt 6731 - Colt 613 - Steyr StG.58 - M1 Carbine - Galil SAR - CZ Scorpion EVO - Franchi PA8 - Glock 17 - Pietta/Colt SAA 1873 - SA 1911A1 Mil Spec - Ruger LCP
At my work, we are still using Harrington & Richardson M16A1's.![]()
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