Magpul Industries Magazine, PMAG 20 LR/SR GEN M3, 308 Winchester/762NATO, 20 Rounds, Fits DPMS/SR25/LaRue OBR, Black MAG291-BLK Magpul's 7.62x51 NATO (.308 Winchester) PMAG 20 LR/SR GEN M3 is a lightweight" cost effective" highly reliable magazine for SR25/M110 pattern rifles. It features true 20-round capacity" a constant-curve body" an anti-tilt follower" and a snap on impact / dust cover. Designed specifically for SAAMI-spec ammunition" the PMAG 20 LR/SR GEN M3 is less than half the weight of standard issue steel magazines and maintains a service life round count approximately equal to the rifle barrel itself.