This article provides an incredibly detailed description and analysis of the weapons used in Heat, with lots of screencaps to illustrate. “Waingro (Kevin Gage) has a blued Star Megastar, in what looks like .45 ACP, which he uses to kill an armored car guard.” In the hotel scene near the end, the author notes that “Waingro is armed with another Star Megastar; this one in stainless steel. Notice the finger on trigger, safety off, and hammer back. Rule number three!” Read the article here: Movie Guns X: Guns Used in Heat.