The glr-16 buttstock for your ar15/m4 provides you with enhanced versatility with it's stock extension and uniquely designed rubber butt pad for fast and stable shoulder positioning.Its unique patented "anti-rattle" mechanism fits perfectly on mil-spec and commercial after-market buffer tubes.Made from fiberglass reinforced polymer composite the stock features three integrated slots for sling attachment one in the front and two at the rear and water-resistant anti rattle storage compartment for two cr123 or aa batteries.This model has a black finish and an adjustable cheek-rest.Type: ButtstockFirearm Type: RifleFirearm Model: AR-15Material: PolymerFinish: BlackSwivel Studs: YesTube Included: No