Magpul Industries Magazine, PMAG 25 LR/SR GEN M3 Window, 308 Winchester/762NATO, 25 Rounds, Fits DPMS/SR25/LaRue OBR, Black MAG292-BLK 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" constant-curve body" anti-tilt follower" and snap on Impact/Dust Cover. Designed specifically for SAAMI-spec ammunition" the PMAG 25 LR/SR also features transparent MagLevel windows to allow rapid visual identification of approximate number of rounds remaining.