The PMAG 25 LR/SR GEN M3 Window 7.62x51 NATO/308 Win, 25rd magazine for SR25/M110 designed specifically for SAAMI-spec ammunition, the PMAG 25 LR/SR features transparent MagLevel windows to allow rapid visual identification of approximate number of rounds remaining. Commercial rifle compatibility includes the 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 and others.*Note- 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. To accommodate longer than SAAMI-spec match ammunition, this magazine may not drop free from all makes of lower receivers. Made in the USA.