Armor

It's not normally genre-appropriate to have armor in a western, but this will become more relevant eventually. I'm pretty happy with how this would seem to work, as it should leave death as a distinct possibility, without making the armor feel useless. 

So armor is rated with a number of dice, just as weapons are. After damage dice are rolled but before determining how much harm has been dealt, roll the armor dice. Each armor die may remove one damage die that is equal or lower.