Injection molded of the same durable material used in the magazine body itself, the extended floorplate shape was designed to comfortably accommodate a proper firing grip. With 2 additional rounds on board, ammunition capacity is now 8 + 1 in the weapon. Also included is a new longer, smooth feeding heat-treated stainless steel spring, with 100% last-round slide lock backs that are guaranteed. The VTMFP-006 43 +2 Magazine Extension consists of Extended Floorplate, Floorplate Retainer and Stainless Steel Spring. Kit converts 1 GlockA(R) magaizine. Manufacturer recommends gunsmith installation of this item. Mfg: Tangodown