Which famous military product was originally designed as a hunting knife before battlefield feedback led to its transformation into an iconic combat tool during World War I?

Throughout military history, certain products have revolutionized warfare and became iconic in their own right. These innovations often began with one purpose but evolved dramatically based on battlefield experiences and consumer (military) feedback. This poll tests your knowledge about how famous military products adapted to meet user needs - a fascinating example of product development driven by the most demanding customers in history.

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The Mark I trench knife, which evolved from hunting designs into a brass-knuckled weapon with a triangular blade specifically for trench warfare
The M1 Garand rifle, which was initially conceived as a sporting rifle before being adapted with a semi-automatic mechanism for military use
The Brodie helmet, originally designed as mining safety equipment before being mass-produced as the standard British Army helmet
The Mills bomb hand grenade, first created as a demolition tool for civilian construction before being weaponized for combat application