Is there a air gun that shoots 2400 feet per second?

I don't believe their is one at present. However the .177 caliber Evanix rifles. AR4 fire at 1450 FPS.

The 9mm can't even shoot that fast if you want a gun that shoots that fast just buy a real one.

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Not what you usually think of when you say "air gun", but there are Pre Charged Pneumatic rifles that can. They fire large bullets using very high pressure air tanks, and can kill large game.