The Daniel Defense MK18 Upper Receiver Group is a high-performance 5.56x45mm NATO assembly for the AR-15 platform. It features a 10.30 cold hammer forged chrome moly steel barrel with a Black Phosphate finish and a 1:7 twist. Built on a Black Anodized 7075-T6 aluminum receiver, it includes the iconic Flat Dark Earth (FDE) Cerakote RIS II Picatinny quad rail. This 3.50 lbs unit is equipped with a flash suppressor, an M16 profile bolt carrier group, and an ambidextrous GRIP-N-RIP charging handle. Note: The 10.30-inch barrel and RIS II rail system are the exact specifications provided to USSOCOM for CQB operations, featuring a rigorously tested bolt-up mounting system.