Currently waiting on my slide to come back from Jagerwerks with RMR milling, and I?m ?in the hunt? for a new AIWB holster. My current AIWB is a JM Custom with wedge, and its been working well for me. Being kydex I think it ought to be a simple process of cutting it back to clear the RMR, but we?ll see when I get the slide back and RMR mounted.
However if you?re wanting to carry with a WML that limits your choices somwhat to which brand and model of light that holster makers are offering their designs for.