Ar-15 Alpha Rail Handguards - Alpha Rail 13'''', Black

Machined aluminum free-float handguard employs a unique barrel nut and rotary-locking system to ensure proper alignment of top rail with receiver rail. Handguard slides over barrel and gas tube at an offset angle, until the notched barrel nut indexes in the internal grooved channel for a secure fit. Two hex head screws lock down the handguard, and a built-in stop prevents over tightening. Vent holes let heat escape the barrel and minimize weight. White alpha-numeric designators on the cross-slot