Magpul’s PMAG 21 GL9 is a must-have addition to any custom Glock setup, or for an individual looking for a higher capacity in their handgun. This all-polymer magazine is highly resistant to crush and impacts, and features a high visibility controlled-tilt follower, a stainless steel spring, a floorplate that's easily removable for cleaning. To ensure faster magazine changes, the PMAG 21 GL9 features ridges floorplate edges for a better grip, and the magazine drops free both loaded and unloaded. In addition, the PMAG 21 GL9 is compatible with any full size, compact, or sub compact GLOCK handgun. Features: Durable all-polymer constructionHigh visibility controlled-tilt follower Stainless steel springDrops free from magazine well both loaded and unloadedCompatible with any full size, compact, or sub compact GLOCK handgun Magpul 21rd 9mm PMAG GL9 Magazine for Glock w/ Window-Holes, Black MAG661-BLK