I have a minimum of three, but if it's a service gun, I want about seven. For instance, for the Sig P220 I have 5 used one (used because I have been using them) and 4 new in wrapper from the factory. For the Hi-Power I must have at least a dozen. For the 1911s, I may have about 3 per gun right now, but I don't keep track of the 1911s or the magazines. For the CZ-75, all I have is three; but I've got about 6 for the Kadet conversion kit.