Ordnance provision system. Ordnance catalog (ordnance provision system): Group P, Howitzer, 8-in., M1, carriage, howitzer, 8-in., M1, and limber, carriage, heavy, M2, major items, maintenance parts and equipment required for maintenance of howitzer. 8-in., M1, mechanism, recoil, M4, carriage, howitzer, 8-in., M1, and limber, carriage, heavy. M2, addendum; Jan. 1, 1943.