 In 1932 404 pieces were accepted (and in 1933 105 more followed, still from the 1932 bunch), but then the production was stopped due to adoption of more powerful 45 mm anti-tank gun M1932 (19-K).1-K was also a base for the 37 mm tank gun B-3 (5-K), the main armament of the BT-2 light tank.1-K was the first dedicated anti-tank gun of the Red Army (RKKA) and as such was actively used for training of anti-tank units.