I am pretty much stuck on Wilson Combat magazines for my 1911s but I am aware that not everyone likes the way they are extended on the base pads.   I am also not an IDPA guy, but I’ve attended a lot of events and I don’t really see much more than Wilson and Chip McCormick being used.    The Chip McCormick magazines from what I have seen are pretty much a toss up when it becomes a relibility question between Wilson combat magazines and them.   There are several things to keep in consideration with each magazine you try.

The first thing I want is reliability,  I would have to say that I’d try 3  magazines with a manufacturer and rotate through about 250 rds and then declare them to work.   The second thing I want from a magazine is for it to drop free.  Giving the number of gun manufacturers out there I wouldn’t claim that Wilson Combat magazines are always going to drop free for you, but I find them to be the best in these regards.   The extended base pads can come in useful if you want extra grip on the magazine when removing it, but I don’t really notice that.   If I was shooting a short 1911 gun, I might notice the lack of flush fitting more.   My Sig 239 is a great CCW gun but if I had anything that wasn’t flush fitting for that I would probable not like shooting it.