The LWRCI ICDI .300 Blackout 16? Direct Impingement M-LOK FDE Upper is a premium AR-15-pattern upper receiver designed to chamber the versatile .300 AAC Blackout cartridge, ideal for hunting, range use, or general-purpose builds. Built to LWRC International’s quality standards, it uses a cold-hammer-forged 16.1-inch barrel with a 1:7? twist rate and 5/8?-24 TPI threaded muzzle, finished in Flat Dark Earth (FDE) Cerakote for durability and corrosion resistance. The upper features a free-float M-LOK handguard, LWRCI’s Direct Impingement system with keyless bolt carrier architecture, and is compatible with any standard AR-15-pattern mil-spec lower. Finished in FDE, this upper provides a durable and attractive foundation for custom .300 Blackout rifles. LWRCI ICDI .300 Blackout 16" Bbl Direct Impingement M-LOK FDE Upper ICDIU3CK16ML