What innovative design feature of the M1 Garand rifle led General George S. Patton to call it "the greatest battle implement ever devised"?

The development of military firearms has shaped the course of modern warfare. Among the most significant innovations was the M1 Garand, the first standard-issue semi-automatic rifle adopted by any major military. This poll tests your knowledge about this groundbreaking product that revolutionized infantry combat and represented a milestone in military retail product development. Do you know the unique feature that distinguished it from other rifles of its era?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Its distinctive 'ping' sound when the clip was ejected
Its semi-automatic operation allowing rapid fire without manual cycling
Its waterproof design that could function in Pacific theater conditions
Its lightweight aluminum components that reduced soldier fatigue