I do refuse to say these are better then the ones already listed
Who the Sam Hell can beat the Wild bunch and Shane.. I mean when Ernest Borgnine does his "he he" after the general gets his... It gives me shivers.. To the carnage that will follow... Plus that drum roll walk into the Generals Village/ fort
But some Honorable Mentions
Butch Cassidy & Sundance Kid..
The Shootist bar room Fight
Pat Garrett and Billy the Kid.. Especially with the directors cuts with Pat Garrett being assasinated in the beginning....