In April 1945. an urgent request was received from the Bureau of Ordnance, Navy Department, for a high cyclic rate 20-mm automatic gun to be used for antiaircraft fire against Japanese suicide planes. The nomenclature T34 had been assigned in November 1944 as one approach to a high-cyclic-ratc operation and many of the principles of this weapon had been tested using standard 20-mm ammunition. Ordnance Committee action was taken to delete the high-velocity requirements in order to fulfill the Navy requirements, and the T34 gun was converted to standard ammunition. The Navy re-quest of April 1945 called for 200 such guns.
The T34 weapon was based on experiments carried on at the Naval Air Test Center at Patuxent River, Md. Modifications of existing components were made to speed up the action of the gun. A Belleville spring buffer was substituted for the conventional spring buffer. The bolt was skeletonized, and the weight was accordingly reduced. The piston was plugged to within 0.202 inch in order to create a high-compression stroke. The functioning of the gun, the detail description of components, and the general data for the T34 are the same as for the
By V J Day, 12 T34 guns with a claimed parts life of 1,500 rounds with 2 exceptions had been delivered.
Tests revealed numerous deficiencies, chicfly
short-lived parts such as driving spring, firing pins, gas piston rings, receiver slides, and slide keys.
The original models of the T34 were built by Oldsmobile. The principal importance of the model is the fact that it was the connecting link between the M3 and the Mk 12 guns. Before this high-speed weapon could be perfected, World War II ended, and all activity conccrning the development of the T34 was dropped. There was a lull
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