First of all, Lock, Stock and Barrel is a popular saying in the United Kingdom and North America, which means "all, all, catch it from head to toe." Because the most critical components of a gun include three parts: 1) Lock, the ignition device of the gun, 2) stock, buttstock, 3) barrel, barrel. These three components are combined into one to form a complete gun, so it implies the meaning of "everything is ready, all in one catch".
Two Barrels refers to the old-fashioned double-barreled shotgun, that is, the two priceless antique guns in the film, both of which are double-barreled. Two Smoking Barrels refers to a smoking shotgun that has just been launched or is being launched.
So the second meaning of using this title is to imply that this is a violent crime that occurred in a modern city, and all the offenders used firearms.
In addition, the title has a third meaning. Lock has the meaning of "marijuana" in English colloquialism, Stock refers to money, and Barrel still means the barrel of a gun, which constitutes the three most critical elements of this movie.
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