Similar to some other values, the 7 Goods has been dominated by the Pinto from the base set, and the later LeMat Revolver.
This one actually started with the name, drawing on Deadland RPG books again. I wanted an Attire, and broadly speaking we have Attire doing 'something' with influence.
Rattler Hide is quite effective at protecting the wearer from Shotgun blasts, and a lethal leather jacket can make even a dude with no influence able to control a deed.
beware bullet reductions during a fight though, you may suddenly lose control of the shootout action at the location in question.