the gun was also used by artillery units of the reserve of the main command (rvgk). in mid-1941 a cannon regiment of the rvgk had 48 a-19; in autumn 1941 these regiments were reorganized, a new, smaller, regiment had 18 a-19s. from 1942 cannon brigades were introduced, with 36 a-19s each. such brigade could be a part of an artillery division - a huge formation, with up to four brigades of a-19 or ml-20 (meaning up to 144 pieces).