Configured for use on the .308 AR10 platform rifles, this A2 Standard Solid Stock Kit includes a Rifle Length Stainless Steel .308 Action Spring, a .308 Rifle Buffer, the A2 Standard Receiver Extension, an A2 Stock Spacer and Screw, and the “Trapdoor” A2 Stock Shell with Serrated Buttplate and Sling Loop. This stock offers a storage compartment accessible through the buttplate trapdoor. All are top quality parts made in the USA.