A convicted felon has been arrested for illegally possessing guns.  The Putnam County Sheriff's Department reports that a search warrant was carried out at a Carmel home on Friday and three firearms were seized including one personally made firearm, a so-called ghost gun.  A 33-year-old Mahopac man who has a previous felony conviction for Robbery, was charged with 5 counts of Criminal Possession of a Weapon.  The man, whose name was not immediately released, was arraigned and released on electronic monitoring. Investigators were assisted by Carmel Police, Westchester County Police Department, Putnam County District Attorney's Office, and the FBI.