This Glock Factory magazine extension will enable you to add two round of 9mm or one of .40 & .357SIG caliber to your Glock factory magazines. It must be used with the insert plate pictured above.
Simply remove the standard magazine base plate and install this factory +2 extension along with the factory magazine insert plate and increase magazine capacity instantly. This +2 mag extension also helps shooters get a better grip on the Mini Glock 26, 27, or 33.
Note: Does not work with MAGPUL PMAGS for GLOCK pistols.