OK... for the bonus round, the was an episode where they are on a planet where thoughts are turned into reality, turns out to be an "amusement planet" of sorts, and Captain Happy Pants gets to be together again with Ruth, who I'm not sure who she exactly was to him... a previous (maybe deceased) wife?
Sulu an avid antique arms collector thinks about and gets a "police special" revolver, and proceeds to get trigger happy with it, much to the distress of Kirk. Anyone remember what it was? I don't....
Edit: Here's the answer it and the other firearms used in the series -
Star Trek: The Original Series - Internet Movie Firearms Database - Guns in Movies, TV and Video Games
Star Trek's creator, Gene Roddenberry, was ex-LAPD and also a stickler for detail and accuracy... it wouldn't surprise me that the stag gripped S&W's in "Tomorrow Is Yesterday" was deliberate and attributed to some little known instance that he knew about. He was fond of sticking in elements like that in the series.