Ordnance Pamphlet 911 is the Bureau of Ordnance technical manual for the U.S. Navy 20-mm antiaircraft gun, Marks 2 and 4. It covers all aspects of the weapon in detail — gun mechanism, trigger mechanism, recoiling parts and buffer, magazine, sight, and shoulder rest — along with ammunition, gun maintenance instructions, cocking and uncocking procedures, and both partial and complete stripping. The manual includes full parts lists for Marks 2 and 4 and a cross-index to OE and Bureau of Ordnance numbers, plus addendum and circular letters.
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