The PMAG 20-LR (Long Range) is a lightweight 20-round 7.62x51 NATO/.308 Winchester magazine compatible with SR25 pattern rifles such as the Knight's Armament SR25/MK11, DPMS LR 308, LaRue Tactical Stealth OSR, and others.  Designed with long/heavy projectiles such as the 175 grain M118LR in mind, the PMAG 20-LR features true 20 round capacity, a constant curve body, four-way anti-tilt follower, and pop-off  dust cover to prevent dirt and debris intrusion and protect the feedlips during long-term storage.  When not in use, the dust cover can be stored on the floorplate.