Ordnance provision system. [Ordnance catalog (ordnance provision system): Group B, Rifle, U. S., cal. .39, M1903, M1903A1 and M1903A3, major items, maintenance parts and equipment required for maintenance of rifle, U. S., cal. .30, M1903 or M1903A1 and M1903A3, addendum; Jan. 1, 1943