Verify the M9F2S is unloaded and safe
Identify the accessory rail on the frame
Select a compatible weaponlight with a matching rail mount
Open the weaponlight’s clamp or mounting latch
Align the light’s mount with the rail slots
Slide the light onto the rail to the desired position
Tighten the clamp or lock the latch securely
Check that the light is straight and fully seated
Confirm the light does not interfere with the trigger, controls, or holster
Test activation and retention before use