During the battle with
Major Ocelot, if you unequip your current weapon and stand out in the open for a few seconds, there were be a secret cutscene where Ocelot accepts Snake's challenge for a quick - draw duel.
When you meet
Major Ocelot at Bolshaya Past Crevice, simply equip the Single Action Army revolver but instead of firing, use the R3 button (Right Analog Stick) to twirl your revolver repeatedly.
Not exact matches
You'll meet Revolver
Ocelot, see how horses and other animals play a
major role in the new sandbox, gawp at the dynamic weather, see Snake headhunt soldiers (and sheep!)