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1.
A gun, usually cheap and having the serial numbers removed, that is used to kill someone and left or "dropped" at the scene of the crime to avoid any connections with the perpetrator and the gun used in the crime.

Sometimes a drop piece can be a gun that has been stolen from someone; therefore the serial numbers will have no way of being traced back to the perpetrator.

A drop piece can be carried by a police officer to plant on people after they have been shot by said police officer to justfify a shooting.
That cop shot the guy, then put a drop piece in his hand.
by Techman April 03, 2008