The 7.62x51 NATO (.308 Winchester) PMAG 25 LR/SR GEN M3 Window is a lightweight, cost effective, high reliability magazine for SR25/M110 pattern rifles featuring true 25-round capacity, next-generation impact and crush resistant polymer construction, constant-curve body, and anti-tilt follower. Designed specifically for SAAMI-spec ammunition, the PMAG 25 LR/SR also features transparent MagLevel(TM) windows to allow rapid visual identification of approximate number of rounds remaining. FEATURES 25-round reliability and no stoppages Anti-glare translucent MagLevel windows on both sides of the body and painted indicator on the spring allow for easy determination of Mfg: Magpul