The PMAG 20 LR/SR GEN M3 is a lightweight, cost effective, highly reliable 20-round magazine for SR25/M110 pattern rifles chambered in 7.62×51 NATO (.308 Winchester).

The GEN M3 PMAGs feature a long-life stainless steel spring, an anti-tilt, self-lubricating follower, and constant-curve internal geometry for reliable feeding. Low profile ribs and an aggressive front and rear texture give positive control of the GEN M3 in all environments, and a paint pen dot matrix at the bottom panel of the body to allow easy marking by the end user for identification. The easy-to-disassemble flared floorplate aids extraction and handling of the magazine while providing improved drop protection, and better compatibility with tight double and triple magazine pouches. Its simple, tool-less disassembly makes for easy cleaning and maintenance.