Best APX holster I have found is the Emdom universal rifle magazine carrier. Since the APX radios have protected buttons, it does not crush the buttons in and cause unintended activations. It goes in or out with no retention strap, won't come out, and works with a body mic or ptt clipped on the side. The taco mag pouch allows the radio to slip out too easily IMO, and is less ideal with body mic or ptt.
Previously, everytime I had to wrestle somone hands on the radio would pop out of the factory carrier, the body mic would come off my shirt, and the battery would come off the radio. None of these are problems now, except for the body mic, and that is reduced by use of a ptt at times for helmet use and the fact the radio never comes out to pull on the body mic in patrol uniform.
As a bonus, the same pouch can be used for 1 or 2 AR mags (retaining the second when the first is pulled), a Surefire 60 round mag, an AK mag, or a .308 mag.
Comes in molle variant only so needs an adapter for belt if not molle, but molle in front allows a pistol and/or flashlight to be mounted to it.