Midwest Industries, MI Two Piece Forearm, Carbine Length Weight: 9.9 oz. No gunsmith installation. Simply install like factory plastic units. MIL-STD 1913 rails. Solid lock-up. T-marked for accessory location. Constructed of 6061 hard coat anodized for a lifetime of service. Grenade launcher or shotgun compatible with lower section removed. High quality at an affordable price.