US Bomb, 250 lb Practice, M124
This bomb is an air dropped, impact initiated, signal generating practice bomb used to train aircrews.
Practice bomb M124 has a streamlined body equipped with a conical tail fin to provide good aerodynamic stability when dropped from high speed aircraft. This bomb is carried on internal racks in bombardment aircraft operating at high speed and/or high altitude. It is not authorized for external carriage. It is shipped and stored empty, but is filled with an inert filler consisting of 156 pounds of gravel and 35.1 pounds of concrete sand immediately prior to use. Normally, complete rounds are assembled as they are used.
The internal design of the bomb includes a small, hollow steel tube which runs lengthwise through the center of the bomb. It extends from the fuze well in the nose to the closing-cap adapter at the aft end. The tube is closed at the aft end with a cork or polyethylene shipping plug. This tube carries the primacord igniter from the nose fuze well back to the spotting charge in the tail fin when the bomb is assembled for use.
Collaborative Ordnance Data Repository