Firearms do not play a major part of the Sleeping Dogs underworld until midway to later in the game. In the mission Chain of Evidence, Thomas Pendrew informs Wei that guns are a rarity in Hong Kong, and the game follows suit with that credo. read more
get your heat level to 2 and the cops will pull out their guns. disarm them or kill them and pick up their pistol. the only gun i've been getting from the cop cars is a pump shotgun. Also I don't think you can get the shotgun if there is a cop driving it and/or just got out of one. You need to atleast get in the cop car to open the trunk. read more