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Posted: 1/3/2014 6:44:39 AM EDT
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I've read quite a bit on the function and order of operations in the gas system on a std AR and I think I understand pretty well why the original Stoner design worked so well and some of the difficulties when playing with carbine length and shorter gas systems. With that said: How does one go about tuning a pistol length system to work reasonably reliably?
Gas block port size? reducing the port size changes they characteristics of the gas charge but leaves the rifle more susceptable to fouling the gas system due to small passages and orifices. Heavier buffers? Thinking a heavier buffer would slow the rifle down a little to compensate for the shorter gas tube and barrel. Tuned/ hand loaded ammo? maybe a faster powder to finish the burn before the projectile reaches the gas port? or a slower powder to tone down the rapid pressure rise spike? All of the above? I would very much like to build a suppressed SBR similar to the Spikes Compressor in 300 Blk as a home defense gun, but need more insight to the tuning of a pistol length suppressed rifle. thanks |
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I would use NSWC-Crane's Mk. 18 specs. (Except for the McFarland 1-piece gas ring by sticking with the standard 3 gas rings)
Barrel —10.3" Carbine Gas Port — 0.070" Extractor —5-coil spring w/ black insert & viton o-ring CQB Receiver |
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