how many bullets do you think you need? box of a thousand 556 green tips about 450$ and those are the ones the military uses. you won't be spraying your guns full auto call of duty style. not even the military sprays bullets like that. just because the rifle has the full auto and burst auto settings on them, doesn't mean they get used. and as a civilian you won't be getting a rifle with an auto-seer in it off the shelf.
United States