GOSAFE Mobile Mag Prevents unauthorized use while maintaining complete mobility and fast access. 10 round capacity. Blocks the trigger. Prevents firing even with a round in the chamber. Cannot be removed from the firearm while locked. Switch to your GOSAFE MAG or OEM mag in seconds. Simple and intuitive. Unique-to-user high security key. Camlock lock for the highest level of protection and quality. Order additional keys once you receive your GOSAFE MAG with the included unique product code on GOSAFENOW.com. Works with all generations of Glock a Compatible with all holsters Mfg: Gosafe