No offense Calicao, but the Poles do it that way, and so do the russians for 40 rounders...
Miwo Military is a Polish company that has a Molle-like system with drum and 40 round RPK pouches. I don't think there is a current importer, but apparently some guys have been able to order from their poish website by figuring out the part number they needed and translating their english email to polish via bablefish.
[ETA] ther E Germans made a belt mounted pouch for the drum that is around $6-10 if you look on ebay or gunbroker, and the Chinese green canvas drum opuch has a sling- probably the easiest/best way to carry. I think Cheaper Than Dirt has those for the $12 each. http://www.cheaperthandirt.com/AKS231-1.html
the Russians also have a couple of vests/chest rigs that carry the 40 rounders. here are some good sites to peruse:
http://tantal.kalashnikov.guns.ru/bstvests.html
http://www.redsoldier.com/All-Products/Tactical-Vests
http://www.russiancombatgear.com/tacticalvests.php