Update - I bought this: https://www.midwayusa.com/product/49...43-nylon-black
It fits into my cargo pocket and holds two G42 mags pretty well. Now, I haven't had it out in the inferno yet but my other DeSantis gun holsters never gave me a problem. It isn't too obnoxious to carry.
Of course, I KNOW - I should carry my G19 or 26 with two extra mag. But sometimes I don't. I usually do but ...