IWB, most comfortable for me, is Stealth Gear ventcore...a little pricey, and don't have every option.

Second is Alien Gear, great price, selection and service, and also pretty darn comfortable. I spoke with Alien Gear about doing a one off and they said no, but if I was handy I could mod it myself, and they would still warranty it after I modified it...that's pretty good.

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Something really smart