By the early 1930s the Red Army (RKKA) started to look for a replacement for the 152-mm howitzer M1909 and the 152-mm howitzer M1910. Those pieces, developed before World War I, had unsprung fixed trail carriages and short barrels, which meant poor mobility, insufficient elevation and traverse angles and short range. Although both pieces were eventually modernized, resulting in the 152-mm howitzer M1909/30 and the 152-mm howitzer M1910/37 respectively, these were relatively minor upgrades which brought only limited improvement in some areas and didn't address others. It was clear that a completely new design was needed. However, at that time, the Soviets had little experience in developing modern artillery pieces.