Question: What is the literal translation of the full name of the gun that replaced the Arsenal submachine gun in Estonian service in 1938?
Sentence (from "Arsenal submachine gun"): A uniquely slender 40 round single column box magazine led to frequent cartridge feeding problems; and cooling fins which were machined lengthwise along the barrel to promote cooling air flow when firing (similar to the Lewis machine gun), unnecessarily complicated production.
Relevant evidence: No