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I take a silver sharpie, and I have a "code" system for my stuff.

Glock 9mm mags get a single dot, at the lower end of he back of the mag for Glock 17, at the upper end for the G19 (I can tell a G26 mag by looking at it).

Glock 40 22 mags get a line across the lower end of the back of the mag to distinguish them from the 9mm.

Any holsters for glock 9/40 get a single dot on them to denote 9/40 size. If they are Glock 19 specific (I only have on raven that is for a 19) I just write "19" on the back.

Glock 45 mags get a + sign on the lower end of the back, and 10mm used to get an open circle o until I sold off the 10mm. All glock 45/10mm holsters were marked with a + on them.

Berettas I would mark with a B in silver sharipe, and when I had a M&P, it was marked "M&P".

It only takes one range trip when you show up with a 9mm and .40 mags and ammo, or one hunting trip where you concealed your 45, and brought a 9/40 safariland holster to OC with at the ranch to figure out a way to not screw that up again.