"Why are Pistols dropped during a hit, but keep the Canolli's"

 

    I have an affinity for movies that deal with payback and revenge for wrongs dealt to the person in question.  Part of the reason why I like the "Godfather", the 1984 version of "Dune", and others, I think it is part of the American psyche for Justice to right the wrongs kinda thing I suppose.

                                                      Here is the scene in question.                  

     This question was asked on Quora...

Why do gun owners in movies and TV shows always drop the gun they used to make the hit? They often do it in the Sopranos and there's the famous scene in The Godfather where Al Pacino does it after shooting two men in the restaurant.

When Michael Corleone drops his gun in The Godfather, it isn't just cinematic flair. A fleeing man caught with a warm weapon is a murderer. Empty-handed, he's just a panicked bystander.

This cinematic staple—often seen in The Sopranos and Goodfellas—reflects a real-world tactic employed by organized crime syndicates to break the physical chain of evidence immediately after a murder. The highest risk of apprehension occurs in the minutes immediately following a shooting, when responding police lock down the perimeter and stop anyone fleeing the area. Abandoning the weapon ensures the shooter can survive the getaway.

To make this strategy work, the firearm must be a "drop piece"—a weapon that cannot be traced back to the killer. Organized crime members traditionally use stolen guns and file off the serial numbers to prevent law enforcement from tracing the purchase history. Before the hit, the weapon is wiped clean of fingerprints. In The Godfather, Clemenza covers the trigger and grip of Michael’s .38 caliber revolver with special tape so it will not hold prints, ensuring that when the police inevitably recover the gun at the restaurant, it provides them with no actionable leads.

Taking the gun home introduces massive, unnecessary legal exposure. Every firearm leaves microscopic, unique striations on the bullets it fires. When crime scene investigators recover the bullets from a victim’s body, they can definitively match them to the weapon used. If a hitman keeps the gun and their home or car is raided weeks later on an unrelated charge, discovering that weapon provides prosecutors with the physical link needed to secure a murder conviction. Leaving the gun at the scene hands the police a dead end, forcing investigators to rely on witness testimony—which, in cases involving organized crime, is notoriously difficult to obtain.

A Smith & Wesson Model 642 compact revolver. Organized crime hitmen often preferred snubnose revolvers because they were easy to conceal and did not eject spent shell casings.