Back in the mid 80’s I saw this movie on t.v. Might have been HBO.
This is what I remember; A young lady hires a man to rescue a girl. Possibly her sister. She goes along with him and his sidekick who is a writer that chronicles his adventures for a comic book.
The hero has the most powerful gun and a red jeep with hidden machine guns in the side windows.
all takes place in a jungle.