There's more companies making IWB holsters for the Q5 SF but not the Q4, what gives?  I really hoped that someone would make a hybrid holster (kydex shell/leather or neoprene backer) that accepts a light but there's none that I can find, I have one but it's trash...why the support for the larger gun but not the Q4?  I have a phlster light bearing holster coming soon, hopefully it'll check the majority of the boxes.

Walther makes nice stuff but they’re almost an afterthought in the market.  I suspect their market share is somewhere in the low single digits.

Any holster for a PPQ should work. PPQ and Q4 slide and frame profile are the same.