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I'm a little bigger than you, but probably proportional (6'2, 220ish) with a gut...

I carry a 4 1/4" 1911 in a CompTac MTAC daily quite comfortably. While it's not "full size" technically, I also have carried my government size (5") in the same rig just as easily.

Find a good gunbelt (5.11's are great, and inexpensive as gun belts go), consider one-size larger in the waist, and give it some time. You'll do fine. Like almost everything else about carrying, it's more about the decision to be successful with it, and you'll find the right groove.

I will say this about IWB carry...moving the rig 1-2" forward or backward makes a HUGE difference in how it "fits in place" and tucks...so don't be afraid to move it around just a bit--the change can be night and day.