Annie Oakley - "The Dutch Gunmaker" (1957)

A Dutch gunsmith, the inventor of an new rifle with superior range, plans to give the weapon to the United States Army in gratitude for being allowed to immigrate.

A crooked businessman decides to take advantage of the man's patriotism and sends an impostor posing as an officer to take possession of the gun before the real colonel can arrive in Diablo.

Director: Earl Bellamy
Writers: Robert Schaefer (teleplay), Eric Freiwald (teleplay)
Stars: Gail Davis, Jimmy Hawkins, Brad Johnson

https://www.imdb.com/title/tt0513481/?ref_=fn_al_tt_1