I have carried a G19 off and on for about 10 years. Really like the G19 and have no problem with the 9mm. But, I got a hankering for a Glock in 45ACP. The G21 and G21SF are pretty big for carry. I've looked at the G30, G30SF and the G36. The 30's are a little thick, but for the most part the size is the same as the G19. Just wanted to get some input (good and bad) from other members that have experience with these models. Thanks in advance.