I’m sure there’s endless supply of adequate makers.
I use Tier 1 Concealment and QVO Tactical holsters.
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Sometimes the cant of the holster, but that depends on the maker. Some traditional IWB holsters have a 15-30 degree cant, whereas a vertical draw is preferred with appendix carry. It's mostly semantics, given it's common to find IWB holsters these days that offer adjustable draw angles.
Much more than semantics, AIWB specific holster will often have the inclusion of a claw/wing and/or padding near the muzzle, both of which are features that can cant the butt of the gun closer to the body to provide better concealment, with neither features being found in typical IWB holsters used in the 0300 to 0400, as there's somewhat less utility there, particularly the muzzle pad.
Indeed, FAR more than semantics.
There are some subtle things in the design that make the difference, in concealment and comfort.
Take any high quality straight-drop IWB, stick it up front.
Do same with a purpose made AIWB. There is a difference.
Me, I use JMCK products for this. They are top notch. All G17 length, usually carrying an optic equipped G19 build.
Wing Claw 2.0 w/ 1 strut w/ fixed soft loop for when tuckable is needed. Standard AIWB w/ fixed soft loops for regular daily concealment. Both with "extra tuck" option, no pad.
Very comfortable, very concealable, fast draw.
Works great when hiking too, totally out of the way of the ruck.
The cant (or lack of) and claw are the big differences to me.
I also use a T1C foam “wedge” on bottom of holster, which helps hold the pistols grip tighter to body, as the claw does.
Does anyone download a round for nutsack security. I know it means you are going to be slower racking the slide but carry in peace?
PB
I will presume that you're not using the hip belts, because there ain't no way I can use AIWB while rucking.
If you're not competent enough to carry with a loaded chamber in general, sure. Don't see why AIWB makes any difference.