The 7.62×51 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.