![]() Unsuppressed and using subsonic loads will make it jam a lot> The back-pressure generated by the can helps in the cycling of the action and the short barrel keeps the round subsonic. The subsonic load of 300 BLK is optimized with a 9" barrel and will only function right with a suppressor attached to it. This is a hard thing to do with a 16" barrel. What you want is a carbine in an AR platform that will handle both supersonic and subsonic rounds and maintain functional reliability while providing the most suppression.You also want a round that will stay subsonic to eliminate the sonic crack associated with high velocity ammo. Most suppressed AR15's in 5.56 will not cycle when fed with subsonic rounds. I know that was a little long winded with a lot of extra info but I hope it answered your questions about how & why ammo, barrels, & suppressors work together (or against each other.) the commercial ammo manufacturers that make it just good enough. You get to make it compliment your specific gun perfectly, vs. That's part of the advantage of making your own ammo. Guns work best when all the parts compliment each other. It might be a squib, or is might just be really inaccurate ammo, etc. ![]() Instead of flash from unburned powder what you get is all the powder consumed with the bullet only part way down the barrel. Now, just like using ammo designed for long barrels in short barrels gives less then optimal performance the same is true if you use ammo for short barrels in a long barrel. Since suppressors work best with subsonics that extra barrel length is just unnecessary. As you understand though the advantage of a long barrel is higher velocity potential. Now, for either the short or the long barrel the powder selection & charge weight can be tailored to produce subsonic velocities. But if we load a fast burning powder that is mostly consumed by the time the bullet leaves the shorter barrel you get less flash & noise. So you get a lot of muzzle flash & noise, and I would imagine not very good suppression. If you shoot this same ammo in a short barrel much of the powder will be burning after the bullet leaves the barrel. If you had a long barrel you'd tailor your ammo with a slow burning powder so as to take maximum advantage. You have to start short just to end up medium length.Ĭonsider if you were making your own ammo. ![]() There's also the practical issue of a suppressor adds a lot of length.
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