Ammunition Storage Components AR-15/M-16 30 Round Rifle Magazine. The ASC AR-15/M-16 30 round magazine features a steel body, chrome silicon springs, and an anti-tilt follower with PTFE. It uses a 300 Series stainless steel floor plate with a black oxide coating for corrosion resistance and is designed for AR platforms including the AR-15. Available in multiple calibers including .223 Remington, 5.56x45 NATO and 7.62x39mm. Package contents include one Ammunition Storage Components AR-15/M-16 30 Round Rifle Magazine.