Which of these military firearms has been in continuous production with the same core design for the longest period, demonstrating exceptional product longevity?

Throughout military history, certain product designs have revolutionized warfare. Some weapons were so well-designed they remained in service for decades with minimal changes. This poll tests your knowledge about one of the most iconic military product designs of the 20th century and its remarkable longevity in the field. Consider the balance of reliability, effectiveness, and adaptability that makes certain military equipment stand the test of time.

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Colt M1911 pistol (designed 1911)
AK-47 assault rifle (designed 1947)
M16 rifle (designed 1963)
Heckler & Koch MP5 submachine gun (designed 1964)