LWRCI Complete Di Upper Receiver 5.56mm 16 inch Barrel 1-7 Twist M-LOK Handguard Black 16in. The IC DI MLOK Upper is a true step up from standard Direct Impingement model. IC DI MLOK Upper Receiver ships complete with LWRCI Bolt Carrier Group Ambidextrous Charging Handle H2 Buffer Carbine Length Action Spring LWRCI Cold-Hammer Forged Spiral Fluted Heavy Barrel. Specifications for LWRCI 16 inch 5.56mm Complete Di Upper Receiver: Manufacturer: LWRCI Caliber: 5.56mm Barrel Length: 16 in Barrel Twist Rate: 1-7 Color: Black Magazine Included: No Features of LWRCI 16 inch 5.56mm Complete Di Upper Receiver Direct impingement system Cold hammered spiral fluted heavy barrel Proprietary di bolt carrier group Mlok free-float rail A2 birdcage flash hider Ambidextrous sling mount Ambidextrous charging handle H2 buffer Carbine length action spring Package Contents: LWRCI 16 inch 5.56mm Complete Di Upper Receiver LWRCI ICDIU5B16ML: Complete Di Upper Receiver 5.56mm 16 inch Barrel 1-7 Twist M-LOK Handguard Black 16in