I use the Comptac double, and they are spaced out pretty far apart. If anything I might ideally put them just a touch closer together, but I go for my 3rd mag so rarely that it doesn't make any real difference (it is extremely rare that the 3rd mag is actually a part of my plan... it is a backup 99.99% of the time), and with the double, at least they will be spaced exactly the same distance apart every time. The double doesn't wander on the belt like the single version can either.