Based on the innovative 300 ACC® Blackout® cartridge, the Blackout® is offered in 2 configurations. Both are 16" heavy, 4150 chromlined, equipped with the new DPMS M111 modular free float tube, allowing you to choose how much rail you want, and where you want them. This rifle is either equipped with an Advanced Armament Corp® Blackout® suppressor adapter or an inert, slipover mock suppressor. The 300 ACC® Blackout® requires no special bolts, or not special magazines. Inlcluded with these rifles is AAC's CAN-U informational pamphlet to better educate and inform you about the myths and realities of legal suppressor ownership.