actually sort their magazines by manufacturer?
When I was at the range last week a fellow board member commented on the mix of manufacturers found in my "ready box" (a small plastic tool box that holds 28 loaded 30 round magazines perfectly).
He was surprised that the 30s were a mix of manufacturers (Colt, LaBelle, Sanchez, Okay). They all run perfectly, and I never really gave it any thought. The only difference I've ever concerned myself with was black vs green followers.
I took a look at the rest of the 30 round mags I have here, and they are from every manufacturer except Cooper. The thirty or so 20 round magazines I have are almost all Adventureline, with about a dozen Colts. No functional differences there either.
On a side note, has anyone ever noticed that there are two different colors of green followers? I didn't realize it until I was sitting here this evening loading up mags for the house gun.