Idea:

Pros:
+50% damage per shot
+100 max ammo
+Each individual bullet has a slightly larger hitbox

Cons:
-30% firing speed
-user is almost stationary while firing
-Bullets have major fallout

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The idea is to have this theoretically do more damage than the normal minigun, but force the user to aim more carefully with it, since the bullets will drop off. This will also encourage taking the highground to "Shower" Bullets down on opponents.