Designed to fit your AR-15 style firearms chambered in .223Remington/ 5.56x45mm. The clear polymer magazine body allows you to monitor your ammunition. A front-load assist, using linked followers and a heat-treated flat spring supports quick and easy loading. This package includes an Operator's Manual, Carrying Pouch, and Graphite Lubricant. Disclaimer: Lifetime Warranty VOIDED if customer disassembles magazine! This magazine is not designed to be used with hollow point ammo. NOT COMPATIBLE WITH SOME AR-15 / M16 / M4 RECEIVERS THAT DO NOT HAVE THE SAME INTERNAL AND EXTERNAL DIMENSION OF A MIL-SPEC LOWER RECEIVER. Specifications Weight: 1.5lbs Compatibility: AR-15 / M16 / M4 Caliber: .223 Remington / 5.56x45mm Capacity: 50 Rounds Body Material: Polymer / Polycarbonate Spring Material: High Carbon Steel