Injection molded of the same durable material used in the magazine body itself, the +2 Magazine Extension 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. Fits Glock G43 model ONLY.Features :Allows Proper Firing GripLonger Stainless Steel Spring100% Last Round Lock Back