[JRandomFreeper]

To comply with the Federal 'undetectable gun act', the inventor installed a chunk of metal in it, just so it sets off metal detectors.

/johnny

[Kevmo]

Got it. But that doesn’t answer the question of what a metal shank is... In prison, it means a self-made knife, for killing other prisoners. What definition is this article proceeding from? Why didn’t they use a different, less evocative term, other than to paint this whole enterprise as extremist?