Rosco Purebred 10.5″ 300BLK AR-15 Barrel

The Rosco Purebred 10.5″ 300 Blackout Barrel is designed for precision in SBR/Pistol setups with suppressors, serving as a direct replacement for MK 18 platforms in 5.56 NATO. Ideal for carbines requiring a slightly longer rail for accessories like PEQ-15’s or D-BAL series. Rosco Manufacturing’s “Purebred” series is a testament to quality, crafted from scratch in their Rhode Island facility with 416R stainless steel. With a heavy profile, 1/7 twist, and a 5/8 x 24 barrel thread, this barrel weighs 21.09 oz and features a pistol-length gas system. The step crown and 80 Grit Bead Blast finish contribute to its durability and performance, while the Nickel Boron barrel extension ensures reliability.