Lasserlyte sells lasers that replace your resr sight. I had one and the switch started to malfunction. I called Laserlyte on the phone and told them what the problem was, I also told them that the one year warranty had run out. I asked them for an RMA # so that I could send it in for repair at my cost. Today the UPS truck delivered a small package. . . It was a brand new $200.00 laser!!!! No cost, just a postage paid envelope to return the old laser!!!!! Talk about great customer service!!!!! iF Y[OU ARE THINKING ABOUT A LASER FOR YOUR WEAPON, YOU CAN NOT GO WRONG WITH A LASERLYTE