My EDC is a Glock 17....I keep one factory in it....and one in the pocket or pouch.....but in the car I keep some Glock 18, 33 rd mags.

In my Springfield Operator....I use Wilson 8rd mags.

I use a bunch of different types of mags for my M9.

Only factory for Hk USP Tactical 45, Ruger MkIIs, and FN 5.7.

What are the oddities for you hand guns?