Magpul brand 21 Round Glock 9mm Magazine Glock 17 / 34 GL9
The PMAG 21 GL9 is a 21-round Glock 9mm handgun magazine featuring a new proprietary all-polymer construction for flawless reliability and durability over thousands of rounds. Meeting the overall length requirements for a 140MM competition magazine, the PMAG 21 GL9 offers additional capacity without the need for expensive extensions. High visibility controlled-tilt follower, stainless steel spring, easily removable floorplate, paint pen dot matrix for mag marking, and capacity indicator windows. Drops free loaded or unloaded. The PMAG 21 GL9 is compatible with all full-size, compact, and sub-compact double-stack Glock 9mm variants with some protrusion below the grip.