These mounts allow any generation FastFire(TM) Series red dot sight to be securely mounted on a specific firearm. Options are available for mounting to handguns, rifles, and shotguns, which each have different mounting requirements. Features : Secure mount for any generation FastFire series red dot GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.