Michigan machinist GarE Maxton makes many different interlocking solid puzzles of this type, but this one, which he calls The Intimidator, is his masterpiece. Starting the disassembly process requires a special key. Once diassembled, about 20 of the pieces can be recombined to make a functioning single-shot pistol. Other parts of the puzzle separately and securely store “a customized set of tools, all necessary hardware, 45 caliber bullets, a standard sight, a laser sight, a cannister containing black powder pellets, a secure storage area for 209 shotgun primers, a spent primer removal tool and a ramrod for loading the bullets.”

via Make: Online : 125-piece puzzle in 6 different metals with hidden “Golden Gun”.