The Professionals - Season 4 - Eps 10: The Gun
A drug addict is murdered by a pusher who then hastily discards the gun, only for it to be found by a young boy-who then accidently shoots his friend in the process. The pusher then goes in search of the boy in an attempt to retrieve the gun and at the same time has to try to avoid his own people who are in pursuit of him.
About The Professionals

Title: The Professionals
First Air Date: 1977-12-30
Last Air Date: 1983-02-06
Status: Ended
Rating: 7.4/10 (from 42 votes)
Language: EN
Seasons: 5
Total Episodes: 57
Network: ITV1
Genres: Action & Adventure, Crime, Drama
Production Companies: LWT
Synopsis
The lives of Bodie and Doyle, top agents for Britain's CI5 (Criminal Intelligence 5), and their controller, George Cowley. The mandate of CI5 was to fight terrorism and similar high-profile crimes. Cowley, a hard ex-MI5 operative, hand-picked each of his men. Bodie is a cynical ex-SAS paratrooper and mercenary whose nature ran to controlled violence, while his partner, Doyle, comes to CI5 from the regular police force, and is more of an open minded liberal. Their relationship is often contentious, but they are the top men in their field, and the ones to whom Cowley always assigned to the toughest cases.
Cast

Lewis Collins
Bodie

Martin Shaw
Doyle

Gordon Jackson
George Cowley