Were I setting up a gun exclusively for subsonic, suppressed use, I would choose an even faster twist rate. The 1:8 twist on my guns is a pretty good solution, but it is right on the edge heavy bullets don't shoot quite as well as lighter bullets in my guns, and they shoot downright terribly in others. The problem is compounded when you download those heavy bullets to subsonic velocities. A 1:10-inch twist will easily stabilize standard 110- to 130-grain bullets, but the long, heavy-for-caliber 220-grain projectiles require a faster barrel twist. Both have 1:8-inch twist rates and Geissele triggers. Both have collapsible stocks and are threaded for suppressors. I currently own two Blackout rifles, a 16-inch gun from Ambush Firearms, which is the hunting division of Daniel Defense, and a tricked-out 16-inch carbine from Houston Armory. ![]() After working with various Blackout guns for the last year, I have to say AAC met those design goals. Its designers also intended for it to provide excellent terminal performance and accuracy when run suppressed with subsonic or standard ammunition. 300 AAC Blackout was designed to give the M4 platform increased power and penetration on intermediate barriers with minimal recoil while retaining the 30-round magazine capacity. 300 AAC Blackout is, in my opinion, the most viable option. ![]() ![]() Several cartridges have come down the pike recently that were intended to replace the 5.56, but the. If the platform has any real weakness, it is the 5.56mm cartridge. The M4 platform has its detractors, but as long as it's kept relatively clean and well lubricated, it is as reliable as any firearm extant, and as for accuracy and ergonomics, the M4 is hard to beat.
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