Given the task definition and input, reply with output. Generate a correct and concise answer for the question based on the words in the context.

Context : The Degtyaryov machine gun (Russian: a Pulemyot Degtyaryova Pekhotny ''Degtyaryov's infantry machine gun'') or DP is a light machine gun firing the 7.6254mmR cartridge that was used primarily by the Soviet Union starting in 1928.
Question : What year was Degtyaryov machine gun commissioned?
1928