It is easy to mount on the gun by simply pushing out and replacing the stock frame pins with the new threaded pins (included). Mount the CK-AMF9 to these pins with the included screw. Push the ergonomic activation button with the index finger and the laser is on target. Programmable laser features a pulse or constant on mode and also has an auto-off function to prevent an unwanted battery drain. An added benefit to the CK-AMF9 is that the laser actually helps to provide safer trigger control by acting as a finger guide without blocking the laser beam. Smooth, no-snag design.