PROMAG MAG AR-308 LR-308 SR25 308WIN 40RD POLYMER

40-round magazine - Fits AR-308 / .308 Cal AR type rifles using LR-308 (DPMS) or SR-25 pattern magazines - Magazine body constructed of a proprietary DuPont� Zytel based polymer - Injection molded magazine follower - Magazine spring formed from heat treated chrome silicon wire - Does not fit rifles using Armalite pattern magazines - Made in USA