I like for there to be an opening large enough for a shell casing to fall through. It's never happened to me but I've trained with a guy who had it happen so I ask my kydex makers to make the adjustment. It's probably totally unnessesary, but sometimes I run the same holster owb on a warbelt for comps and such.
Other than that, water drainage.
As others have mentioned, some holsters have full open muzzle to allow g26/19-17 and such, which I think is cool
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