PLUS 4 MAGAZINE EXTENSION FOR GLOCK .45ACP

Add 4 rounds to your G21 magazines! Machined from billet aluminum, this magazine extension is engineered to add 4 extra rounds to the standard Glock 21 magazine. It comes with a special, extra power spring that is designed to handle the extra rounds. Simply replace your factory magazine extension This extension is used by top competition shooters nationwide and works flawlessly.