This Glock-compatible magazine extension for the G19, G23, and G26 offers a more advanced and effective alternative to the limitations of the OEM Glock magazine. While the standard capacity of the G19 magazine is 15 rounds, Tyrant CNC's Glock-compatible mag extension increases capacity by up to 5 rounds. Each purchase includes a 10% power spring and is easy to install with no tools needed. Features : Color: Grey Designed for Glock Models: 19, 23, 26 Glock Generation: 2, 3, 4, 5 Works on 15-round Glock Mags (Not PMAGs) Add 5 Rounds of 9mm or 4 Rounds of .40 GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.