[DUMBGRUNT]

A forty-foot barrel will need a tripod or two.

And guessing the bedding is heavy?

[Fai Mao]

Congress will declare this an “Assault Style Weapon” and make it illegal.

[E. Pluribus Unum]

A standard .308 round, among many others, will do the same thing with a normal length barrel.

[immadashell]

Don’t let Alec Baldwin anywhere near this peashooter!

[Larry Lucido]

Railroad tracks? :-)

[Jim W N]

What’s the speed after the atmosphere slows it down, if it doesn’t burn up first?

[AndyJackson]

projectiles at speeds that can reach 2,000 mph (3,200 kph). Not quite the speed of a meteorite, but given how they shoot steel ball bearings, among other things, the results should come close enough.

It's a start, but it is not close enough. A micrometiorite has a velocity 15 times that of this gun, or 225 times the energy density. That's the difference between fracturing something and vaporizing it - literally.

[Liaison]

Rods from god.

[PIF]

2,000 mph (3,200 kph). Not quite the speed of a meteorite, but given how they shoot steel ball bearings, among other things, the results should come close enough.

—
Close enough? Verses 10 kilometers per second (22,500 mph)? Close? What?

[Chode]

“air gun capable of shooting out one end”

well, yes, anything coming out the back would be sub-optimal...

[The MAGA-Deplorian]

Hear that Taiwan? Silent air canons shooting thousands of ball bearings at 150 incoming jets at 2000 mph! Instant hamburger!. Oops!