I think you should make the fire bird do damage more rapidly like m3 will do 12 damage per half second. The freeze is well balanced with low fuel but high damage but the islda I believe is a little bit Over powered. It can heal and hit at crazy angles which I think sohlud stay but I think it should not be able to heal itself if it can. I don't know about this but i'm pretty sure it can while attacking an enemy or its just a glitch where another islda is invisiable.

Its a epic gun even though I can't use it. The power of a M3 thunder plus the medium fire rate of the smokey it can kill alot of people in about 4 shots or less (counting mamoths) in less than 4 seconds