Brand-new, factory-made, Generation II magazines built by ArmaLite feature a spot-welded, heavy gauge steel body that won't distort when fully loaded and a contoured follower designed to ensure exceptionally smooth, reliable feeding. These aren't converted M14 magazines, but mags purpose-built specifically for the AR-10 Type "B" lowers only - the same mags that come with new rifles. Available in 5-, 10-, and 15-round capacities to fit a wide range of hunting, competition, and law-enforcement applications. Factory marked floorplate. Will only fit Armalite AR-10 rifles, no other makes or models. Mfg: Armalite SPECS: Steel, Parkerized, matte black. Fits ArmaLite AR-10 chambered in .308/7.62mm. Will not fit the type "A" AR-10 designed for P-MAG magazines with an "A" serial number prefix.