While I posted links for the Fistful of Frags to give people a feel of the weapon, i neglected a simple fact. The FoF Mare's Leg is more of an long barreled lever action pistol using rifle rounds for ammunition. This Massachusetts Mare's Leg is more of an short barreled lever action rifle, using rifle rounds for ammunition. Speaking of ammo where do you put it? Like for the Shotguns, or?

And here are my proposed statistics:
How about this, this thing is like the Spy's Ambassador in function.
Pros:
Regular total ammo size, but different type. And does NOT use the Pistol ammo.
So 6 shots that are a bullet not pellets.
Only Headshots crit.
Cons:
10% slower reload rate
You cannot fire it continuously if you want to headshot.

Alt fire: You take aim, which increases the firing speed(by x%) and accuracy(by 25%), but decreases your speed (by 10%).
Taunt Kill: The Scout Takes aim and shoots someone in the head. And then does the one handed reload. The loop reload. the zone of death is close to medium range, so be vary.

Crafting Recipe: 1 Ambassador + 1 Baby Face's Blaster + 2 Reclaimed Metal.

If you think you can do better, good but sometimes it is good to change it up. So a rifle for the Scout, that is good. Changes his play-style and all that.
Edit: added crafting recipe, and taunt kill. Added Alt fire. and moved the accuracy buff to the alt fire.