When she was shown the gun, he said it had 2 triggers, one to cock it and one to fire it. Also, said it was a 45. Hard to tell, who looks at the gun! I just assumed he was describing a schofield. Also, Ernest Borgnine was shooting a 1875 Remington in the last scene, I believe.
In one of the scenes, she is walking out to the beach. My wife qips...looks like she has both barrels loaded... I roared! And she is not even a CAS lady (although she is likeing my new found love of westerns)