Summary
Despite some advantages of the NM, notably its versatility and very light weight for a 152-mm piece, the production was cancelled after a limited number of guns were built. According to M. Svirin, complexity of the design was the main reason. For example, Soviet ordnance plants experienced major problems with production of sliding breechblocks. Also, the NM poorly fitted the Soviet artillery doctrine, mainly because of its range - too short for a divisional gun. The related German design - the 15 cm sIG 33 - was employed as a regimental weapon; it was somewhat heavy for a regimental piece. In the RKKA, the niche of heavy regimental weapon was filled by a 120 mm infantry mortar, a cheaper, lighter weapon with slightly longer range, but on the other hand less powerful, less accurate and less versatile. Eventually, a need for a divisional weapon more powerful than a 122 mm howitzer became apparent; in 1943 the RKKA adopted another infantry mortar, the 160 mm divisional mortar MT-13, which was similar to the NM in terms of weight, range and shell weight.
Read more about this topic: 152 Mm Mortar M1931 (NM)
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