The LWRCI ICDI .300 Blackout 16″ Direct Impingement M-LOK OD Green Upper is a premium AR-pattern upper receiver built to chamber the rugged and versatile .300 AAC Blackout cartridge while delivering the craftsmanship LWRC International is known for. It features a cold-hammer-forged 16.1-inch barrel with a 1:7″ twist rate and 5/8″-24 TPI threaded muzzle, all finished in Olive Drab (OD) Green Cerakote for corrosion resistance and a tactical aesthetic. The unit includes a free-float M-LOK handguard for modular accessory mounting and utilizes LWRCI’s Direct Impingement system with keyless bolt carrier design — the same rugged architecture found on full ICDI rifle models. It’s designed to pair with any standard AR-15-pattern lower to create a custom .300 Blackout build that balances reliability, performance, and modern ergonomics.