Hack may refer to: Hack (technology), a term used in the technology and computer science fields; Hack (masonry), a row of stacked unfired bricks protected from the rain; Hack ...

Hacking may refer to: A form of the verb hack; Computer security hacking where someone attempts to defeat or exploit the security capabilities of a computer system. A casual form ...

verb (used with object) 1. to cut, notch, slice, chop, or sever (something) with or as with heavy, irregular blows (often fol. by up or down): to hack meat; to hack down trees.

SOC] posted this crazy real life lancer on the AR15.com forums. You are seeing it right, that is a chainsaw bayonet attached to his assault rifle.