You will be given a definition of a task first, then some input of the task.
Generate a correct and concise answer for the question based on the words in the context.

Context : The Ingram Model 6 is a .45 ACP caliber submachine gun that was manufactured from 1949 through 1952 by Police Ordnance Company of Los Angeles, California.
Question : In what year did Ingram Model 6 enter service?
Output:
1949