Designed for steady, repeatable performance in varied environments, the FAB Defense FXGLSHOCKPC GL-Shock PCP Buttstock for AR-15/ M16/ M4 emphasizes functional reliability and straightforward operation. The GL-Shock absorbing Buttstock contains an "Anti-Rattle" recoil-reducing mechanism with a built-in premium silicon chrome alloy spring. Made from Mil-Spec reinforced polymer composite, the stock is compatible with both Mil-Spec and commercial tubes and features watertight battery storage for two CR123A 3V lithium batteries or AA 1.5v. It has an integral ribbed rubber butt pad with a non-slip design and Quick Detach sling swivel connectors on both sides. Ideal for range training and recreational shooting, the adjustable cheek-rest and built-in dual Picatinny rails enhance precision shooting capabilities. FAB Defense is renowned for its innovative designs and commitment to quality. Key Features: Manufacturer: FAB Defense, Model: FXGLSHOCKPC, Product Type: Buttstock, Material: Polymer, Finish: Black, Rails: Picatinny, Weight: 1.2 lbs, Length: 10.5-13.5 inches, Swivel Studs: Yes.