Every time Guy pulls out his 1911 .45 pistol, there is a sound of the hammer being pulled back and/or the safety being taken off. However, Guy is consistently shown with the gun in his left hand, and the thumb safety switch on a 1911 is on the left side of the frame (side opposite of your left hand's thumb). It is possible he's left the safety off, and is thumbing back the hammer, but this would mean he's carrying it with a round in the chamber, and the hammer down, with no safety - the most dangerous possible way to carry a 1911 (known as "Condition 2"). A slight tap on the back of the hammer, while in this condition, would set a round off. As a trained guard who carried a 1911 often, he would have known better.
Once again frequent gun cocking sounds are heard, such as when Madsen goes into Ray's apartment. Her gun is a hammerless model that cannot be cocked. Another example takes place after Madsen shoots Hastings with her secondary gun. The gun cocking sound is heard as she points her gun at him, but having been fired, it was already cocked and could not have made the sound.
Annie in 2012 says she was 8 when her father died (in 1963), meaning she was born circa 1955, so she would be age 57-58 circa 2012. The actress that plays her, Lini Evans, is far younger than 57.