I've had one in .45 ACP for a lot of years. It spends a lot of time in my gun safe for no logical reason because it is fun to shoot. Great for knocking down plates at 50 yards and beyond. I reload my own and use a 185 hollow point with a maximum load of Unique and it shoots great. They are tough and are also heavy. They don't sell them with sights so you have to get a red dot and it has to be mounted high in order to sight comfortably. And, of course, you have to use the bottom-end of a.45 Auto. The back-up service is very good. I had a broken extractor years ago (which, I understand was a common problem with the early ones) so I sent it back to them and they replaced the extractor and really "tuned" it-no charge for anything. Here's their site:
Mech Tech Systems, Inc.