A Man, a Horse, a Gun is a 1967 spaghetti western. Oh, I do hope I never run out of spaghetti westerns! This one stars Tony Anthony in the 2nd of the 4 Stranger movies. Dan Vadis, Marco Guglielmi and Ettore Manni are also in this film. The score is by Stelvio Cipriani and adds a lot to the watching of the movie. I'm unfamiliar with this series, but after seeing this one I'll be looking for all of them.
Spaghetti-Western.net calls it "an enjoyable story of greed, double cross and violence presented with odd humour and taciturn dialogues."