Ord 8 SNL. Higher echelon spare parts and equipment (addendum). A-50. Gun, automatic, 40-mm, M1, carriage, gun, 40-mm, M2 and M2A1 (A. A.), carriage, gun, twin, 20-mm, M4 (A. A.), and mount, gun 40-mm, M5 (airborne), Changes 3; Feb. 5, 1944.