On average, I keep five mags per gun if they're strictly range toys. My social guns have more mags of course. I have about 25-30 8rd 45xx mags and I have a 4506-1, 4566, 4566TWS, WVSP 4566TWS, and a 645. So that equals about the same general layout for my range toys. My 4040PD, I have like six mags for it. My 909 is at four or five. My 6906 is like a fifteen. But that's because I kept my 5906 mags and got the grip spacers for them. Same with my 4013 TSW. My 3913 is at like eight magazines.