Strike Industries Magazine, 223 Remington/556NATO, 10 Rounds, Fits AR-15, Polymer, Black SI-AR-MAG-10 Strike industries AR-15 Magazine (10 rounds) is a high-strength polymer .223 Remington/5.56 NATO AR-15/M4/M16 compatible magazine. With the AccuRamp first round feed tray design feature" keep your eyes on the target knowing that your reloads are ready to go. To ensure the last little bit of reliability" there is an included anti-tilt follower so even uneven pressure will not lock up this magazine no matter which hand you use.