I'm not replying to my own post, but as I was watching " death hunt" tonight and seeing your post's. Several more came up.
1) Lone wolf Mc Quade.
2) Hard target.
3) The Big red 1>
4) The quick and the dead, with Sam Elliot and Kate Capshaw.
5) The Jackal. original and with Bruce Willis.
6) Nevada Smith, with Brian Keith, Steve McQueen, Carl Malden, Martin Landau, powerful story.
7) Jeremiah Johnson.

Escape from New York.
9) Cobra.
10) Invasion USA, BEST MUZZLE FLASH MOVIE.
11) Lonesome Dove, with Tommy Lee Jones and Robert Du Vaul.
12) Grosse Point Blank ( comedy )
13) Dusk til dawn, " may have already been mentioned.
Not gun related, but stong movies,
The emperor of the North Pole, with Lee Marvin, and Ernest Borgnine, Hobo's and Train personell on a brutal level.
The Jack Bull, personal sacrifice in the name of justice, whoo, cold and hard. With one of my favorite B actors, LQ Jones.
I'm sure more will come up, as I screen your suggestions, I'm going to start cataloguing, these for future reference.