1. Firing tables (A. A, control tables) for gun, machine, cal. .50, Browning, M1921A1 and M2 (watercooled and heavy barrel) firing cartridge, ball, cal. .50, M1; Aug. 1938. Bookmark Corporate/Agency Authors: Ordnance Department Publisher: Ordnance Department Date: [1938] SuDoc number: W 34.34:0.50-AA-E-4