Hi. Im putting together my first belt setup for IPSC production shooting. Trying to keep costs low. I have a Uncle Mikes duty belt and inner belt (my used belts from my police duty gear) and Im going with the safariland 5198 holster with midride attachment.
Now looking for mag pouches and have my eyes on blade tech signature pouches. I have 5 mags so I want to get 4 pouches.

Most setups I see have single mag pouches, why is that? I was thinking of getting 2 double mag pouches to carry my 4 spare mags (again to keep costs low)

What do you guys think, 4 single mag pouches or 2 double?