Personally, it was either possible or not possible. Simple as that, I am sure there is a source that says yes or no. I read above an account of somebody replenishing the tail gun. So, make it like the reload pad. ".xferammo 200 5 4" (Transfer 200 rounds from position 5 to position 4) or whatever ammount was contained in a box. If the source position had fewer rounds than a set ammount then it could not be done. Also, when I said make it like the reload pad, make the gunners unavailable for like 1 minute or whatever. So that way, yes you get ammo, but you gonna pay for it if you get bounced.