The CMMG FN Five-seveN 10 Round Magazine Extension is designed to increase the capacity of your Five-seveN pistol magazine by 10 rounds. Built from durable polymer, this extension matches the contour of your Five-seveN magazine and pairs with a corrosion-resistant chrome silicon spring to support reliable feeding in high-stress target or defensive situations.
Installation is straightforward and does not permanently alter your factory magazine. Simply remove the floor plate, inspect the factory mag opening for burrs and remove any if necessary, install the extension, insert the spring, and replace the floor plate. This product is NOT compatible with the newest magazines, only the older style magazines.
