Most of the "micro" series are two small to hold a average size gun and the micro series does not come with the plick and pluck foam that is so great for forming it to the contents. I recomend
www.cases4less.com they have the best prices I have found and I have many many pelican cases (over 30) if you want an idea of the model numbers here is what I have in some of mine by model number.
1120 - Naa mini revolver, keltec 32, guardian, seecamp, guardian 380
1150 - Kahr MK9 P7M8 officers models glock 30, 36
1200 - almost any self defence size gun will fit in these full size 1911, full size glocks etc
1300 is a deeper model of the 1200 I think and since that isn't important when talking handguns I don't have any
1400 - longer barrel revolvers, 2 hanguns like a pair of gov't models, I also keep my ruger .22 with 5.5 in barrels in there both in one case.
This is one gun per case, not all of those guns in one case.
As a side note open cell foam is not the best for preventing rust but most of mine are also in Bianchi Blue bags as the represent compleated projects of guns I rarely use. You can put some moisture absorber in there and help take care of it. They are air tight.
The micro's are more suited for things like cell phones, first aid kits, gps etc when rafting