On maps when you're fighting and are running out of ammo and are too far away from your tent to get back safely maybe... Ammo clips laid around the map. The problem is though is that players might bury the ammo clips. Maybe they randomly spawn on blocks? Anyway it would probably look like a clip from all 3 guns. I don't know if this is a good idea... Is it? I think it would be useful on large maps. Or maybe have a command that's like an airstrike but drops an ammo pack on you. Like a certain streak maybe 5 and type something like /ammo and it falls from the sky with a parachute. Anyway I want to know what you, the community, think.
Edit: Well there's already a suggestion like that but I'll just leave this here.