The title of the 1998 film Lock, Stock and Two Smoking Barrels is a play on the traditional English idiom which means "the whole thing" or "in its entirety". Title Meaning & Origins

The traditional phrase refers to the three primary components of an old firearm, such as a musket or flintlock rifle: : The firing mechanism that ignites the gunpowder.

In the 1800s, because a firearm consisted of only these three parts, owning or selling something "lock, stock, and barrel" meant you had every single component—the complete item. The first recorded figurative use of this idiom appeared in a letter by in 1817. Origins of the Phrase 'Lock, Stock, and Barrel'

: The metal tube through which the bullet is expelled.

: The wooden handle or frame that rests against the shooter's shoulder.