So the concept is, a cannon that shoots a load of random metal bits at relatively high speeds, that obstruct projectiles, sort of like missiles, but non-explosive, far less damage, bit faster, and, obviously, no guidance system. It' arguable whether or not to put them in a missile slot because of a sort of similar function, but a much different use.
It's uses would be various. You could use it as an anti-fighter weapon, an anti-missile weapon, or use it to obscure your enemy's view for a bit. Or, if nothing destroy's them on the way there, it could do damage to the enemy, assuming you actually hit them with the spread of junk.
Hope ya'll like my idea, and it's obvious inspiration from another game.