ProMag Industries Magazine Features This magazine is engineered to function seamlessly with AR-308 and .308 caliber AR-type rifles that use LR-308 (DPMS) or SR-25 pattern magazines ensuring a perfect fit and reliable feeding. The magazine body is made from a high-strength heat-resistant polymer that withstands harsh use and environmental conditions. Additionally the injection molded magazine follower and the heat-treated chrome silicon wire spring ensure reliable cycling and longevity of the magazine. It s important to note that this magazine does not fit rifles that use the Armalite pattern magazines which ensures users select the correct magazine for their specific rifle setup. ProMag Industries Magazine Specifications Brand: ProMag Industries Capacity: 20 Rounds Fits: SR25 and DPMS Pattern AR10 Caliber: 308 Winchester/7.62 NATO Construction: Polymer Color: Flat Dark Earth Features: Constructed of a proprietary DuPont Zytel based polymer Injection molded magazine follower Magazine spring formed from heat-treated chrome silicon wire Compatibility: Does not fit rifles using Armalite pattern magazines Country of Manufacture: U.S.A.