Magpul Industries PMAG 25LR/SR Gen M3 Window 308WIN 25 rounds Fits DPMS/SR25/LaRue OBR. The 7.62x51 nato 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.