Bushmaster's ACR (Adaptive Combat Rifle) has been updated to take on new challenges, improving on functionality and modularity. With tool-less disassembly allowing quick caliber change options, the ACR is one of the most field adaptable MSR platforms. The 7-position collapsing, folding stock is adjustable for LOP and cheek rise, and the optic-ready AAC Square Drop modular handguard system accepts KeyMod type accessories. This updated ACR has an FNC-treated 4150 CMV steel barrel, fully ambidextrous controls, and features a full time ambidextrous charging handle. This carbine-length model in 6.8 Remington SPC II offers increased energy for down-range performance. It has a black finish, 16.5" barrel with an AAC Blackout flash hider allowing rapid attachment of AAC silencers, and includes a 25-round polymer magazine.