The Taran Tactical Innovations GLOCK Base Pad is precision-engineered for GLOCK models 21 and 41 adding +4 round capacity to your .45 ACP magazines with premium billet aluminum construction.Compatible with GLOCK models 21/41 (.45 ACP)Increases magazine capacity by +4 roundsMachined from billet aluminum for durabilityHard anodized flat black finishPush pin design locks securely to magazineMade in USAThis professional-grade base pad enhances your GLOCK's capacity while maintaining reliability and durability through precision manufacturing and premium materials.