I'm assuming it's a 45, they did make them in 9mm as well.
It's a nice little gun.
Recoil can be a bit snappy, some eject the spent brass in random directions, need the extractor tuned or replaced if this happens. 45 acp brass can leave a circle cut in the center of your forehead, lol. Older recoil springs were only good for 500 - 750 rounds, I have heard the newer ones last longer. The sight is not that great for longer range shots.
That being said I really enjoy mine. It conceals well, and is fun to shoot. I treat it like I would a snub nose revolver, more point and shoot at closer ranges. The trench sight works ok but not quickly. Imo. Quickly may be the wrong word, i got used to it, but it's a different animal than my other carry guns. Probably why I practice more point n shoot with a quick glance down the trench sight.
Same basic gun as a colt defender, just a different sighting system.