I had a Glock 17; loved it. Figured if a 9mm is good, a 45 is better, so got a Glock 21. It was too big for my medium sized paws, and the more I shot it the more uncomfortable it felt. I understand there are enough people like me that Glock has come out with a modified grip for the 21, I forget what they call it, but there's less of a reach to the trigger. I've got to try one of those, as I like the 45 round and like the Glock gun but didn't like the combination I tried.