The Odin Works Extended Magazine Base Pad was designed with the competitive and noncompetitive shooter in mind. Ergonomically machined to fit perfectly in the palm of your hand for effortless stripping, the weighted base allows for rapid mag changes and 5 extra rounds all while remaining well within the 140 mm gauge limits of USPSA. CNC machined out of 6061 billet aluminum and hard anodized to ensure durable, long-lasting color the PMB (Pistol Magazine Base) comes complete with an extra power spring and a proprietary threaded pin to ensure extremely limited mag failures. The ODIN PMB will keep you at the top of your game. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.