The Tiger Rock Inc. BR300-MICRO 300 Black AAC barrel delivers unmatched precision and durability. Engineered for optimal performance, its compact 5-inch length and 1:7 twist rate make it the perfect choice for serious shooters. Constructed from 4150 Chrome Moly Vanadium steel for longevity Sleek black nitride finish for corrosion resistance .750" gas block diameter for optimal gas flow 5/8"x24 thread pitch compatible with various muzzle devices Designed for target shooting and home defense Elevate your AR-15 setup with the Tiger Rock BR300-MICRO.