Two Guns for Two Twins 1966

Starring Pili y Mili, a popular Spanish TV and movie duo in the 1960's. They performed several song-and-dance numbers in this film, along with the sharp-shooting. It is a decent story with lots of action and some classsic Spaghetti Western tropes such as saloon fistfights, gun duels, and wicked rustlers. Directed by one of the Marchant brothers, Rafael Romero Marchent, who directed many other Spaghetti Westerns.

Check out my list: https://trakt.tv/users/jeffsmith99/lists/spaghetti-westerns-i-want-to-watch

Hard to find - I watched it in Italian with no subtitles and washed-out color (but still fun to watch) in a playlist with 8 segments on YouTube as "A Woman for Ringo" https://www.youtube.com/playlist?list=PLB5C2D5A8E442FE28

List of alternate titles from IMDB
Spain and Mexico (original title) Dos pistolas gemelas (Two Twin Pistols)
Austria and West Germany 6 Kugeln für Gringo (6 bullets for Gringo)
Brazil Duas Pistoleiras Invencíveis (Two Invincible Gunmen)
Greece (transliterated title) Kanena oikto gia ton Ringo (No pity for Ringo)
Italy Una donna per Ringo (A Woman for Ringo)
Mexico Dos pistolas gemelas (Two Twin Pistols)
USA Sharp-Shooting Twin Sisters ; Two Guns for Two Twins; Woman for Ringo