Bushmaster M4 Patrolman AR15 Complete Upper Assembly - Black | 5.56NATO | 16" Barrel | A2 Handguard w/ Detachable Carry Handle | A2 Flash Hider

Features: - Caliber 5.56 NATO (.223 REM) -16" Barrel with a 1:7 Twist Rate - Overal length: 25"  - A2 Style Handgaurd with Detachale Carry Handle - Salt Bath Nitrate MPI Bolt Carrier Group - A2 Birdcage Flash Hider 1/2 x 28    Proudly Made In U.S.A.