If you have some toy soldiers handy, you can get something together fast and give the rules a spin. It even includes campaign rules. Loads of weapon options so, while you could play a gunfight in the Old West, you could also say...have them transported to a fantasy or science fiction setting and throw down for time traveling mayhem.
While you do need 10 sided dice to play, online die rollers exist and that means that these rules, some models and a measuring tape or ruler are all you need to try out the game.