One Horse AR-15 300 BLK 10.5" Pistol Gas Barrel

300 Blackout was drawn up around exactly this barrel length, which is why a 10.5" tube gives up so little compared to the 16" version. The pistol length gas system matches the short barrel and keeps the rifle cycling smoothly with the lighter supersonic loads as well as the heavy subsonic stuff.

The barrel handles both ends of the 300 BLK bullet weight range, so you are not locked into one type of load. Muzzle threads are 5/8-24, the standard pitch for the cartridge and the reason a suppressor is such a common pairing here. Medium profile contour keeps weight reasonable up front, and the nitride finish handles corrosion.