Currently the only way you can see which manable guns are alive is to click on them.
If they are dead, you must click the pop-up away and try another, and another. Usually by the time I have found the right/not-dead gun, it's being straffed as I get in it.
My recomendation:
4 colors;
Red = Dead gun.
Orange = Occupied gun
Green = Available gun
blue = Available and the one that is sellected.
Warm colors are not available.
Cool colors are available.
eskimo