The GLOCK plus magazine extension is compatible on double stack magazines for 9, .40, and .357 caliber GLOCK models. This part includes the necessary insert required to install the extension onto a magazine. Adds 2 rounds on 9mm magazines and 1 on .40SW and 357sig.
THESE DO NOT WORK ON GLOCK 43 MAGAZINES.
NOTE: This is a composite item and the inventory may not be reflected correctly on the webiste. Please give our customer service line a call to check inventory before placing an order.