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. Rifle Spring fits buffer tube for fixed, A2-type rifle stock; will not work in carbine tube.
Big Book Catalog, Issue:65, Page:521
Big Book Catalog, Issue:65, Page:586
SPECS: Rifle Spring - 12¾" length. Carbine Spring - 11½"