A disappearing gun, a gun mounted on a disappearing carriage, is an obsolete type of artillery which enabled a gun to hide from direct fire and observation. The overwhelming majority of carriage designs enabled the gun to rotate backwards and down behind a parapet, or into a pit protected by a wall, after it was fired; a small number were simply barbette mounts on a retractable platform. Either way, retraction lowered the gun from view and direct fire by the enemy while it was being reloaded. It also made reloading easier, since it lowered the breech to a level just above the loading platform, and shells could be rolled right up to the open breech for loading and ramming. Other benefits over non-disappearing types were a higher rate of repetitive fire and less fatigue for the gun crew.

Driggs-Seabury Ordnance Company was founded in 1897 by William H. Driggs and Samuel Seabury, both US Navy officers, in partnership with William's brother Louis Labadie "L. L." Driggs, originally to produce guns for the US Army and US Navy designed by the partners. After a few reorganizations and an entry into the motor vehicle market, the company reorganized again in 1925; its ultimate fate is unclear from references.