Precision-machined and hardened, steel bolt stops help ensure consistent bolt release and lockup, and offer increased service life over the factory part. Extended model features a large, easy-to-find, serrated pad to help reduce the time it takes to get the bolt back into battery after a magazine change, and is standard issue on many U.S. Military MK14 Mod O and M-14SE rifles. Standard version offers the same reliability, but maintains the snag-free, low-profile contour of the factory part. Both models have a low maintenance, Parkerized finish to resist corrosion. Mfg: Smith Enterprise SPECS: 8620 steel, black, matte, Parkerized finish. Hardened to Rc 35-38 Internal, Rc 60 Surface. Extended – 5/8" (15.9mm) long, 9/16" (14.3mm) wide, 7/8" (22.2mm) high. Standard – 5/8" (15.9mm) long, 9/16" (14.3mm) wide, 3/8" (9.5mm) high.
