The 7.62x51 NATO PMAG 25 LR/SR GEN M3 Window is a lightweight magazine for SR25 rifles featuring 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. Note: compatible with 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. Specifications for Magpul Industries PMAG GEN M3 AR-10/SR25 .308 Win/7.62x51mm NATO 25 Round Rifle Magazine: Manufacturer: Magpul Industries Color: Black Fabric/Material: Polymer Magazine Capacity: 25 Round Cartridge: 7.62x51mm NATO, .308 Winchester Gun Make: AR Platform Gun Model: AR-10 Weight: 0.44 lb Package Contents: Magpul Industries PMAG GEN M3 AR-10/SR25 .308 Win/7.62x51mm NATO 25 Round Rifle Magazine