Western 'genre' set on the moon:
http://www.imdb.com/title/tt0064691/
Also, I saw a sci fi western a while back that culminated in the 'white hat' looking for the badguy and the badguy ends up throwing acid on the whitehat's face. I can't remember the title, nor have I found it on imdb...but it had a fairly well known lead. Annnyway, they had blaster type pistols.
Really looking forward to Cowboys & Aliens too.