I haven't tried this one and i'm not going to but I think the best bet would be the MTAR. It has a good balance between accuracy and range. it also has the slowest rate of fire for the class which might help when you want to be precise. I would use the grip and the flash suppressor to bring the accuracy up as high as you can.
as for getting it from hits on a chopper, idk about that. if it works on stuff like that you might be able to put an entire mag into an IMS.