Today's pistol-caliber carbines are all the rage, and many of these PCCs are based on the popular AR-15 platform. Stern Defense answered the call for a dedicated bolt designed for these 9mm AR-15s. The Stern Defense 9mm AR-15 Bolt, designed for use with both Glock®and Colt magazines, is machined from 8620 AISI steel and is treated with a hardened, Melonite finish. The bolt will work in all standard and Glock-pattern upper receivers and is compatible with standard charging handles. Each Stern Defense 9mm AR-15 Bolt comes completely assembled, including all necessary pins and springs. The bolt will not function with a full-automatic fire-control group.