A Town Called Malice is a set of free wargames rules for wild west gunfights. The rules set was used by the North London Wargames Group for their 2015 club convention game.
wild west
Building A Western Gaming Table
The Great Escape Games forums have a very nice photo tutorial on making a western mine gaming table.
Wild West Exodus Free Core Game Rules
Wild West Exodus is a skirmish game that mashes the 19th century American West with steampunk and horror themes. You can get the free starter rules here.
Victory Conditions For Old West Games
Too many skirmish games just turn into a bloody “to the last man” smackdown. That’s all well and good, but if you want to add a little more complexity to your evenings, Jackson Gamers has a list of objectives and victory conditions for wild west games.
Old West Sheriff’s Office Paper Model
Here’s a nice paper model of an old west sheriff’s office. It’s apparently designed for Playmobil figures, but you can scale it to whatever size you need when printing.