YHM Barrel, 300 AAC Blackout, 9.1" Threaded 1:8 Twist, Melonite QPQ Finish YHM-71-T

Features a .300 AAC Blackout chamber and constructed of 4140 chrome moly steel with a threaded muzzle (5/8-24 tpi). Melonite finish for surface protection. Gas port has been tuned to lock the bolt open on the last round when using subsonic ammunition with a sound suppressor or supersonic ammo without a suppressor. M4 feed ramps. 1:7 inch twist rate. Length: 9.1 inches. Weight: 1.1 pounds. Exterior diameter at gas port: 0.750 inches. NOTE: Use of this barrel on an AR pistol is legal, but the use of this barrel on any AR15 rifle/carbine will qualify the firearm as an SBR and the firearms needs to be registered as such.