A nose assembly for a floor nail gun includes: a base having a bottom end that has a base contact surface; a nose plate having an abutting end defining a nose abutting surface, and a contact end having first and second nose contact surfaces; and an urging mechanism interconnecting the base and the nose plate. The nose plate is movable relative to the base from a first position, in which one of the first and second nose contact surfaces abuts against the base contact surface, to an intermediary position, in which the contact end of the nose plate is spaced apart from the bottom end of the base, and is further movable relative to the base from the intermediary position to a second position, in which the other of the first and second nose contact surfaces abuts against the base contact surface.