The LWRC ICDI Direct Impingement .300 Blackout 16.1" M-LOK Complete Upper Receiver is a premium AR-15 style upper built around LWRC’s proven direct impingement system and a cold-hammer-forged, NiCorr-treated barrel with a 1:7? twist and 5/8×24 muzzle threads for a muzzle device or suppressor. The mono-forged upper pairs with a 12? M-LOK free-float handguard and a proprietary nickel-boron coated BCG for smooth cycling. Ambidextrous controls and a full-length Picatinny rail make it ready for optics, and it’s designed to mount to any MIL-SPEC AR-15 lower receiver. Whether you’re building a dedicated .300 Blackout rifle or upgrading a current setup, this upper combines robust LWRC construction with direct-impingement performance. LWRC ICDI Direct Impingement .300 Blackout 16.1" 1:7" 5/8x24 Bbl M-LOK Black Complete Upper Receiver ICDIU3B16ML