A compressed gas regulator of a piston type is disclosed in which a regulator is configured with an input valve situated entirely inside a compressed air canister, which regulator is then attached to a paintball gun, marker or other device for providing discrete charges of gas at a predetermined pressure to the attached device. A conductive member is arranged adjacent to the longitudinal edge of the buss bar, and contacts the buss bar with at least 40 A-spots per inch, along substantially an entire length of the buss bar. This enables the user to control the lighting parameters simply by controlling the position of the controlling member. A lift bridge is adapted to be positioned on the forward ends of the lift arms whereby the power unit is operable for use as a load-lifting jack; and the bridge is further adapted to be displaced from the forward ends of the lift arms whereby the power unit is operable for use with the jack stand.