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I'm just an 04. I run convoys. Nothing to extreme. We are not allowed riggers belts but I do have a solid Velcro belt.
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If you are running convoys, sitting in a vehicle, I'd steer clear of a thigh or drop holster. There isn't much leg room in vehicles, and a thigh holster makes it even worse. Plan on putting the M9 in a vest mounted holster. Something that will keep off your belt and leg that will give you comfort and mobility when operating in a vehicle. In a pinch, you can use an M4 pouch as a holster.
I'm a cav scout and spend 50/50 between mounted and dismounted. I have a Safariland 7Ts with a g-code adapter. I run a duty belt mount with 2 in drop and a vest mount. I can move the entire holster from my chest to my belt holster depending on my activity.