Say “prison weapon,” and most people think of handcrafted knives – known in convict parlance as ‘shanks’ and ‘shivs.’ They’re the most plentiful illegal weapons found inside jails and prisons because they are easily crafted and concealed. Often, they are crude – sharpened butter knives or spoons that have been flattened and honed to a point, for instance. But some convicts combine equal portions ingenuity, resourcefulness and desperation to produce truly remarkable prison weaponry. Frighteningly deadly and destructive arms turn up every so often and fortunately, most such weapons are ferreted out by prison staff before they’re put to use. Such was the case in 1972 at medium-security Collins Bay Institution in Kingston, Ontario, where staff discovered that a convict or convicts had crafted a deadly, working shotgun (pic after the jump) using common bits of hardware.