So, how about we make this a laser medigun?

Fires laser projectiles at about the same speed as a rocket launcher's rocket, and similar fire-rate to the cow-mangler.
Projectiles penetrate players.
On allied hit: +10 health. Gives the target +4 health regen per second for 4 seconds. User gains 5% Ubercharge on hit. Counts once per player hit per projectile.
If an invisible enemy spy is hit, they will be revealed in the same way as if they were bumped into.

Ubercharge can be built up with primary weapon damage.
+50% Ubercharge duration.
Ubercharge gives a shield that lets the user absorb 50% of incoming damage.
Ubercharge is active regardless of active weapon.
Cannot Ubercharge patients.