I tried AIWB and couldn't stand it. I could barely hide a Kahr CM9 because the holster stuck out so much and it was insanely uncomfortable. I'm 6'0 and 220 but pretty fit. It just didn't work for me. IWB in a supertuck is where it's at.
With the shorter-barreled guns, you've either got to lower the gun (and thus slow down your grip) or have the holster extend further than the muzzle in order to make them work AIWB. I have a DSG AIWB that I bought second-hand that works well enough for that purpose. It doesn't seem to have some of his newer features, though. FWIW, the only non-custom holsters I've tried that've worked for AIWB have been a Raven Vanguard 2 for a Glock and a High Noon Mr. Softy (which mysteriously fits every gun I own, but has a slow draw because of how low it rides).
Comfort is very position-based for me. Try a few different locations. You'd be surprised how much difference a quarter of an inch left or right makes.
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Based on what I've seen, AIWB seems ideal for tall skinny types. I tried concealing at 4:00 for a year or so when I started carrying, and eventually convinced myself I needed a subcompact. Kept getting smaller and smaller guns in order to conceal how I felt was necessary. It was also less comfortable, as the end of the gun would pinch my ass against car seats. A short gun with a long barrel would have been ideal, but that's a different conversation.
Once I discovered AIWB, I started backtracking, carrying larger and larger guns as I realized they all concealed the same way but that I shot the large ones much better. Larger guns were more comfortable here as well.
I am 6'6" and 200 lbs. The only other person I've come across carrying appendix was around 6'3" and also around 200 lbs. Ironically we were both carrying in JMC Kydex. That was when it clicked for me. I think people with more average body types are better off at 4:00; that's probably most people. But for me AIWB is what let me finally be comfortable carrying. All the other advantages aside, AIWB lets me pay attention to my surroundings instead of whether or not I'm concealed, which is probably the most important thing I get from it.
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Bravo Concealment DOS. It just wasn't comfortable at all. When I was sitting it poked me in both directions and as far as concealability, I don't know that it's any less concealable, but I feel like I was more aware of the slight bulge with it sitting on the front of me. It felt like the first time I ccw'd all over again. I was checking myself every 10 seconds. I ditched the holster, later ditched the gun for a G26 and never looked back. I'm happy with IWB, it works for me.
ScotchMan--I am neither a tall nor skinny type (6'/200lbs) and have no trouble with AIWB; in fact, most of the good shooters I personally know who AIWB are all smaller than me...
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