Magpul Industries Magazine, M3, 308 Win/762NATO, 25 Rounds, Fits AR10 Rifles, Compatible with M118 LR Ammunition, Black MAG577-BLK The 7.62x51 (.308 Winchester) PMAG 25 M118 LR/SR GEN M3 Window is a lightweight" cost effective" high reliability magazine for SR25/M110 pattern rifles using longer than SAAMI-spec match ammunition up to 2.830" OAL. Features true 25-round capacity" constant-curve body" anti-tilt follower" snap on Impact/Dust Cover" and transparent MagLevel windows to allow rapid visual identification of approximate number of rounds remaining.