@Mad Professor, I tend to agree with you, mostly, but a lot of holsters, hybrids in particular it seems, are made with the muzzle end open so one holster fits multiple guns of the same make with differing slide lengths. Crossbreed Supertuck and similar for example. OWB Holsters like the Jak Slide, most other belt slides, the Yaqui Side and similar are designed as open end holsters too. I would say to be a bit more careful if you are going to carry with an exposed muzzle, and certainly, check things out so you don't end up looking stupid or worse. I just have several G43 holsters already and wanted to know if using one or more of them was feasible with say...the G48, would work until I decided it was ready to get the gun a specific holster or two made just to fit it.
The issue I have seen most and experienced most too was snagging the front sight, seems more of a problem with a leather rig that with a sturdy, open end kydex. And yes, a hair dryer or heat gun can easily take care of a tapered muzzle (curled under at the end where the bullets come out) end on a kydex holster to minimize that sagging problem.
Honestly, that is one of the reasons I’m not a fan of hybrids. I only own one crossbreed and I only keep it to show others why I don’t recommend it. Same with a Jak-Slide. It is just a compromise I’m not willing to take when I don’t have too. But I understand and have used something less desirable at times to test and train until I could get something more suited to my tastes. Then the other goes to the demo/loan pile.
I’ve waited on a good holster 16-18 weeks more than once. Even ordered holsters before I had the gun to put in it at least one time.
Back on the 43X-48, I know at least one AIWB manufacturer that is already shipping holsters to specifically fit.