Genuine DPMS factory parts will help you repair an existing rifle or correctly install a stock to a custom build. Buffers and springs are weighted to function properly in DPMS LR-308 and Remington R-25 rifles. Complete Carbine Stock Mounting Kit includes heavy duty, six-position aluminum buffer tube (also called the receiver extension) for mounting an M4-type collapsible stock to your .308 rifle. Includes the receiver extension, locking nut, and correct-weight buffer and spring. Available to fit Mil-Spec or Commercial stocks. Carbine Buffer and Buffer Spring also sold separately. Rifle Buffer and Spring fit buffer tube for fixed, A2-type rifle stock; will not work in carbine tube.
Big Book Catalog, Issue:65, Page:521
SPECS: Mil-Spec assembly fits 1.14" O.D. M4-type buffer tube. Commercial fits 1.17" O.D. M4 buffer tube. Receiver Extension – extruded aluminum, hard-anodized matte black. 7¾" (19.7cm) long. Endplate – Steel, matte black phosphate finish. 1-3⁄8" (3.5cm) wide, 2-1⁄16" (5.2cm) high, 1⁄8" (3.2mm) thick. Carbine Buffer – Steel body. 2½" long, 3.7oz. wt. Rifle buffer – Aluminum body. 4-7⁄8" long. AR-10 and Rock River .308 will require a different Buffer Assembly.