I think that using this as a Wild West shootout type thing would be better.

Altifire: Fanning, which is when you pull back the gun's hammer manually. That would increase this gun's fire rate, at the cost of movement speed. The movement speed could be -10%, like the not boosted BFB. Also since it is a Revolver, it should use the Spy Stock Revolver damage stats.

Pros:
Uses the Spy stock Revolver Damage stats.
Alt-fire: Fanning which decreases your speed for 10%(the BFB penalty) but increases your damage output, until you have to reload.
Taunt kill: Showdown.
Cons:
It is six shooter, therefore -50% ammo in the magazine. Which is 6 +36= 42 by 6 mag bullets=7 mags.
A bit slower than the stock but not PBPP slower firing speed. It is supposed to be a old timely Wild West Revolver. For a Scout, not a Spy.

Edit: Removed the reserve ammo penalty. Added the Spy Stock Revolver stats. Added Fanning