BREEK ARMS Plan B Sentinel Caged Flash Hider designed for Plan B compatibility and pin-and-weld applications. Features a closed-tine, fully shrouded profile to enhance flash suppression while minimizing snag risks with gear or clothing. SPECIFICATIONS: Weight: 2.4 oz; Overall Length: 2.15"; Material: 4140 Hardened Steel, Nitride; Thread Pitch: 1/2x28TPI (223/556); Caliber: 223/5.56; 9mm compatible (exit hole = 0.369 inches); Suppressor Mount: Plan B / Atlas; Torque Spec: 20-30 ft lbs; Peel Washer Included; Designed & Manufactured in America; Engineered to be pinned & welded on 14.5" barrels to meet the 16" Federal minimum length requirement.