I just recieved a c-tac IWB yesterday. I love it so far. I usually carry a p11 with the belt clip at 5'oclock, but with the full size mp40 I like it at 3 1/2 oclock. lol More comfortable in the car. As far as the mp40 goes, I picked mine up about 3 weeks ago. Fired 600 rounds through it with out one problem, (cheap 100 pk bulk S&W ammo from walmart) I think I'll start carring thiis weapon all the time. Ive only had problems with teh p11 when trying aftermarket 15 round mags, it as roughly 1500 rds through it.. Sorry to get off topic..
Go C-TAC