The ZEV extended magazine release enables shooters to easily depress it and drop a magazine from their firearm without shifting their firing grip. Compatible with all X Series grips, M17/M18 grips, and Gen1 P320 grip. Does not include spring or stopper. Reuse factory parts to install Brand ZEV Category Magazine Releases Model Extended Mag Release Color Black Firearm Fit Sig P320 Gen 1 Compatible With Gen 1 P320 Grips Weight 0.25 oz