FAMILY:AR-15 Rifle Series MODEL:DDM4 300S SBR TYPE:NFA - Short Barrel Rifle ACTION:Semi-Auto FINISH:Matte Black WEIGHT:5.77 lbs. CALIBER/GAUGE:300 AAC Blackout BARREL:10.3" OVERALL LENGTH:26.75" RATE-OF-TWIST:1-in-8" ADDL INFO:S2W Barrel Profile ADDL INFO:DD Improved Flash Suppressor ADDL INFO:DDM4 Rail 9.0