The following weapons were used in the film The Ruins:
Single Action Army
Lead Mayan (Sergio Calderón) carries the Single Action Army revolver into his holster and uses it many times.
Colt Single Action Army w/ 7.5" barrel known as the "Cavalry" model.
Lead Mayan fires his SAA.
Remington Rolling Block
Two Mayan Riflemans (Luis Antonio Ramos) and (Walter Quispe) uses the Remington Rolling Block rifles, but all shots of it were very blured due the moving.
Remington Model 1867 Rolling Block Carbine - .50-45
Rifles at the background.