The strike 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.Anti-slip finger grooves on both sides of the magazine help give positive tactile control when inserting the magazine.Molded into the bottom of the magazine base plate, there is a channel made for magazine pouches with shock cord to help provide additional retention.The slick-profile design makes it easy insert and remove in a double or even triple stack magazine pouch setup.Made in the u.Sa.Caliber: 223 RemCapacity: 10rdModel: Replacement MagazineMaterial: PolymerModel Fit: AR-15Capacity: 10