Strike Industries Magazine, 223 Remington /556NATO, 32 Rounds, Fits AR Rifles, Polymer, Black SI-AR-MAG The Strike AR-15 Magazine is a high-strength polymer .223 Remington/5.56 NATO AR-15/M4/M16 compatible magazine. They've managed to give you two plus (2+) extra rounds compared to the standard AR-15 magazine" which keeps you in the fight or have additional fun at the range without having to reload. With the "AccuRamp" first round feed tray design feature" keep your eyes on the target knowing that your reloads are ready to go. 32-Round Capacity Polymer Construction Anti Tilt Follower Made in the U.S.A.