Another interpretation could be business related: i.e., one would own "the lock" as in the building, stock as in the stock exchange, investments, etc., and "barrel" as in all inventory, etc.
The title Lock, stock, & Barrel is also the title of an artbook by Darci Robbins. The artbook includes pinup illustrations, character biographies, and concept work of the up-coming webcomic titled "La Cosa Nostra"; which is about a young girl being thrown into the world of crime and hatred, that is the mafia.
Lock, stock, and barrel is also referenced in the title to the Guy Ritchie movie Lock, Stock and Two Smoking Barrels, as well as in the title of Jerry Thorpe's 1971 Western film Lock, Stock and Barrel.
Also, Officer Lockstock and Officer Barrel are two characters from Urinetown: the Musical. Another musical that used it was the animated musical The Nightmare Before Christmas by Tim Burton featured three infamous children, the 'Trick or Treaters' 'Lock', 'Shock' and 'Barrel'.
Council homes sell-off move; Ministers accused of opening the way for lock, stock and barrel sale with pressure for transfers
Sep 05, 1998; EXCLUSIVE THE Government was last night accused of attempting to sell off Scotland's housing stock "lock, stock and barrel''...