Two NYPD cops on a coffee-run arrested a gun-toting Brooklyn man outside a Crown Heights deli Wednesday, authorities said.

The 77th Precinct plainclothes officers were stopped at a red light in their car on Kingston Avenue at Bergen Street when they saw the man suspiciously trying to stash a bag in the corner deli.

The cops detained Willie Brown and went looking for the bag. They found a loaded 9mm Smith and Wesson hidden inside a pair of work boots, police said.

Brown, 32,, who has eighteen prior arrests, was slapped with a charge of criminal possession of a weapon.