More ammo is probably more powerful than people realize, given that this is an action economy combat system and you will spend a fast or slow action to reload a magazine fed weapon (depending on your RC reload roll).

Screwing around with a magazine in your hand is time you could have been killing Soviets!

You spend an action to reload a belt fed weapon also, but you do so a third to a quarter as much. That means MOAR dead Soviets! HUZZAH!