TacFire AR10 Stock Kit Black Polymer for .308 Platform is a durable impact-resistant A2-style fixed stock designed for AR10/AR308 rifles. Crafted from black polymer it fits standard AR-10/AR-308 lower receivers and includes everything you need: a rifle-length receiver extension tube A2 buffer buffer spring spacer and screw. The unique hinged butt plate reveals an internal storage compartment for added functionality making it a versatile and dependable upgrade for your firearm.