A tubing conveyed well perforating system, used for the completion of formations for both testing and production, comprises tubing means (14) extending from the surface of the earth down a well bore to a location therein; perforating gun means (30) connected to one end of the tubing means, the perforating gun means including: body means (50); detonating cord means (94) extending from the top of the body means through a portion thereof; connector plug means (68) secured to the top of the body means having one end of the detonating cord means secured therein; hollow elongated cylindrical member means (84) secured to the connector plug means; explosive means (86) retained within the hollow elongated cylindrical member means; tubing connector member means (62) having one end connected to the body means and the other end connected to the tubing means; and weight actuated primary detonating means (100) adapted to move through the tubing means, contact the perforating gun means, and cause the detonation of the explosive means retained within the hollow elongated cylindrical member means and the detonating cord means of the perforating gun means.