Purchase a rare weapon from a gunsmith

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There are 5 rare weapons in the game but you only need to purchase one for this trophy/achievement Below are the locations of the rare weapons.

Mauser Pistol--- Buy Only From Blackwater, West Elizabeth
Lemat Revolver-- Escalera Gunsmith, Mexico after the Revolution
Carcano Rifle --- Blackwater Gunsmith
Evans Repeater---- Blackwater Gunsmith
Semi AutoMatic Shotgun --- Escalera Gunsmith