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, constant-curve body, anti-tilt follower, and features transparent windows to allow rapid visual identification of approximate number of rounds remaining. The PMAG 25LR/SR brings GEN M3 improvements to the LR line along with more of a good thing in the form of 25 rounds of capacity. Keep track of those rounds with MagLevel Window functionality, for the first time, now available in a 7.62 PMAG. Compatibility Commercial rifle compatibility includes the new Armalite AR-10A, Bushmaster .308 ORC, Colt LE901-16S, CORE Rifle Systems CORE30, DPMS LR308, JP Enterprises LRP-07, KAC SR25, LaRue OBR, Les Baer .308, LMT .308 MWS, LWRCI REPR, Mega Arms MATEN, POF P-308, Remington R-25, Ruger SR-762, S&W M&P10, SIG716, and others.* *NOTE: NOT compatible with Armalite AR-10B, Noveske N6, 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. Features and Specifications Next-generation impact and crush resistant polymer construction Constant-curve internal geometry for smooth feeding Anti-tilt, self-lubricating follower for increased reliability High-quality stainless steel spring, black-oxide coated (MIL-DTL-13924D) Anti-glare translucent MagLevel windows on both sides of the body along with a painted indicator on the spring allows for easy determination of rounds remaining from 1 to 25 Ribbed gripping surface and new aggressive front and rear texture for positive magazine handling Paint pen dot matrix panels on the bottom of the body to allow for identification marking Flared floorplate aids magazine handling and disassembly yet is slim enough for use with many pouches