This is the Magpul PMAG 20 round magazine chambered in .300 AAC Blackout. More compact than 30 round magazines, the PMAG 20 features increased maneuverability and creates a more concealable package for use in small format firearms.

Along with optimized .300AAC BLK performance, the 20 round PMAG incorporates all of the GEN M3 features, such as next-generation impact and crush resistant polymer, aggressive texturing, an easily removable floor plate, a paint pen dot matrix for marking and identification, and an optional dust/impact cover.