It's an interesting read (if you like marketspeak) but the mooment he claims there will be no recoil is the moment it becomes obvious the man has not a clue. I wouldn't hold my breath on this one.
If a projectile flies off in one direction, the gun has an equal and opposite force applied to it in the opposite direction, regardless of how the projectile was accelerated.
Add to this the difficulty in aiming up or down (the thing is a large gyroscope. Having a second wheel spinning the opposite direction would cancel out this gyroscopic resistance, but would put tremendous force on whatever was holding the two wheels together any time you tried to move it.
Consider next the musket balls it fires. No rifling, no barrel even. Better yet, you'll have the balls rolling along the inner surface of the wheel before they are released, and you'll end up with a wicked slice, or some good old ping pong english. The thing would be bending it like Beckham.
It will take a load of power to get that much mass up and spinning, and to keep it spinning thanks to the air friction that would have to be present since the thing will be open to the air (the balls have to exit somewhere).
If its structural integrity is breached.. oops. Metal balls flying out in all directions and a thousand feet per second (or much much more if the "inventor" is to be believed")
Sure some of these may be overcome, but I doubt it will be by someone who doesn't believe in the law of conservation of momentum.
I'm seeing a use for such a thing launching something into orbit long before I can see it being used as a machine gun
