I have two guns I carry CCW, however I never carry IWB so I can't help you there. I carry either a M60 3" with Crimson Trace grips or CS45 with night sights and Big Dog's delrin grips. I carry both in a Bianchi Black Widow holster under a loose shirt. The CS is probably more comfortable with it's flat sides and delrin grip, but it is a bit heavier. But with that said, I pretty well can forget I have either on most of the time.