No recoil? Newton's going to be pi$$ed off that his 3rd Law doesn't apply any more.
No moving parts? An interesting concept for a centrifuge!
As the bullets (ball bearings) will be ejected from a centrifuge, presumably they will gain a sideways spin. Resulting in 120,000 banana shots per minute. Must have a computerised sighting system to allow for the horizontal (as well as vertical) flight curve.
I can see this weapon (in automatic or remote controlled mode) being classified as a mine, and therefore being banned.