The Taran Tactical Firepower Base Pad for GLOCK 21/41 enhances your magazine capacity by adding 4 extra rounds of .45 ACP. This innovative base pad not only boosts your firepower but also increases the weight for quicker magazine drops, facilitating faster reloads during critical situations. Its patented push pin design securely locks onto the magazine, allowing for easy field stripping and cleaning between use. Constructed from CNC-machined billet aluminum and finished with a durable hard coat anodized treatment, this base pad is built to withstand rigorous use while preserving its color. Please note, this base pad is not compatible with 10-round magazines and meets USPSA 140mm gauge specifications.