Well it would still use one paintball per shot, but it would shoot slower.
It would be slightly faster than a pgp, but would shoot dead straight, would use no barrel, and would shoot as far as the eye can see. Also, would have a zoom/scope function in place of grenades. SO whatever your grenade bind would be, you could hold it for a scope, or tap it to zoom once, then twice, then off.
Thoughts?