My memories of this are pertty vague, but I'm fairly certain that it
Was Audie Murphy. I think the hero was injured or something, and
Cut down a shotgun, sawing off the barrel and the stock to make a
Shotgun pistol, and then using it in a swivel holster. Any ideas what
Movie this was from, and was it an Audie Murphy flick?

Thanks.

Do you mean Eddie Murphy? Perhaps look on imbd for his movie listing