Description 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 windows to allow rapid visual identification of approximate number of rounds remaining.Features & Specs:Caliber: 7.62x51mm / .308 WinchesterPlatform: AR10, M110, SR25Capacity: 25 roundsWeight: 6.5 oz.Length, max: 7.75 in.Compatibility: Armalite AR-10A, Colt LE901-16S, CORE Rifle Systems CORE30, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, Noveske Gen III N6, POF P-308, Ruger SR-762, Ruger Precision Rifle, S&W M&P10, SIG716, othersMade in the USAOther Specs:Optimized for use with SAAMI-spec 7.62x51/.308 Winchester ammunitionNOTE: Compatible with older model Bushmaster .308 ORC, Remington R-25, and DPMS LR308 rifles, but not optimized for bolt lock functionality with newer models based on the DPMS GII design. NOT compatible with Armalite AR-10B, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417 or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines.