I put it on my .45acp Ruger model 345. Shot fifty rounds of 230 grain mil. spec. ammo. It still works. To turn on push switch from right to turn with your right index finger so it works best if you are right handed. Windage and elevation screws hold settings but mounting screw loosens so Locktight mounting screw and it will work fine.
While tightening the cross screw be sure to push forward on the laser sight because that is the direction the recoil will try to move it.
Pros: Great if you shoot with your right hand
Cons: mounting screw loosens unless you use Locktight on it.
This review was written in the old system and had content requirements that are different than reviews written today.