The PMAG 10 5.56 AC is a reliable and durable polymer 5.56x45 NATO (.223 Remington) magazine for short action AICS (Accuracy International Chassis Systems)-pattern bottom metal, including the Bolt Action Magazine Well for the Magpul Hunter family of stocks. Consisting of qualities that make all of their PMAGS the most reliable in the industry, the PMAG 10 5.56 AC features GEN M3(TM) technology, a self-lubricating follower, a stainless-steel spring, and constant-curve internal geometry for smooth feeding. An offset feed lip geometry maximizes bolt face engagement, guaranteeing a reliable feed. Like all Magpul bolt action magazines, it features a paint-pen dot matrix for visual identific Mfg: Magpul