Enhance your Glock's performance with the Pearce Grip Magazine Extension for 45 ACP. Expertly crafted from durable polymer this sleek black extension seamlessly replaces the magazine floor plate boosting your magazine capacity by two additional rounds. Specifically designed for high-capacity Glock 21 Gen3-4 magazines this extension ensures a perfect fit while maintaining reliable functionality. Ideal for those seeking to maximize their firepower this extension is not compatible with 10-round M20 M21 or M30 magazines making it a tailored choice for Glock enthusiasts looking to optimize their shooting experience.