It would be cool, if it worked.
But "virtually silent"?
Have you ever been anywhere near a centrifuge?
"Recoilless"?
Ever heard of "conservation of momentum"?
(Yes, releasing something from a spinning "holder" doesn't generate recoil. But since the thing shall only shoot in one direction, not all at once, there'll be an unbalanced load in the centrifuge, creating a force that will feel exactly like a "real" recoil.)
"The operating mechanism simply doesn't allow for stoppages or jams to occur".
Ugh. No comment, except: BS!
"Heatless and frictionless"
This one actually hurts.
So this thing is in a vacuum, using magnetic bearings, and has a magic motor that doesn't create waste heat, despite running at many 1000 rpm?
"projectile velocity can be adjusted instantly back and forth between lethal and less-lethal/non-lethal modes"
Uh, have you ever heard of the word "inertia"?
You know, that thing that means you can't just change speeds instantly.
And don't forget, DefRev also reported the Stavatti Laser Rifle as genuine...
