The GLOCK plus magazine extension is compatible on 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.
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.