The Arredondo Glock Mag Extension increases the capacity of your Glock magazines (+6 for 9mm, +5 for .40 S&W, +4 for .45 ACP/10mm). Comes with extended 10% magazine spring and dissassembly tool. Watch the installation video to fully understand how this item fits and functions.
• USPSA limited 140mm length legal
• Magazine not included
• Will not function in post-ban, 10 round magazines