I might not be following with what has been said but heres my answer to your question.
mags >>> KA mids (the 110 round ones) are good, as long as you emtpy them after the game is over. Otherwise the spring will compress and you may get feeding issues. Also open em up and keep the spring lubed.
vest >>> finding 7.62 pouches was a pain in the arse for me but the vest that did the trick for me was the Phantom (now known as Pantac) Wasatch replica. I got mine...from 204 tactical? 1337tactical.com also has them I believe. they already come with pouches built INTO the vest. I was able to fit 10 - 12 mags in there it was a lil tight but im a fit fella so if you have a bit of a belly might be too tight for yah. Vest comes with a hydration pouch in the back of it and an admin type pouch built into the top of it, its like a pouch where you can toss a map / pad of paper with objectives or something more or less small.
http://1337tactical.com/shop/product...?productId=128 thats the vest