I sent my M&P 40 slide to Novak for Fiber-Optic sight installation. It went out on a Friday, came home from work Wensday it was back, looked good! I ran out to the garage to put it on the reciever, Whoops! it would not go on. I got to looking and the stiker safety stop was frozen in place would not move down at all. I finally got the striker out of it, it now goes half way down but slide in inoperable. I sent it right back to them. I was wondering if anyone else has had any experiance with Novak. I have a 1911 pro series which came with the adjustable fiber optic site, liked it, thought I would go with it on the MP........