What product innovation feature made the American 'Kentucky rifle' revolutionary compared to standard British military muskets of the 1770s?

During the American Revolutionary War, colonial gunsmiths created a weapon that gave American forces a significant tactical advantage against British troops. This innovative long rifle, often called the 'Kentucky rifle,' represented one of the earliest examples of American product development specifically addressing battlefield needs. Test your knowledge about this iconic military innovation that changed warfare tactics and helped shape American independence.

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Rifled barrel grooves that dramatically improved accuracy and effective range
Interchangeable parts that allowed for rapid field repairs
A percussion cap ignition system replacing unreliable flintlocks
Mass production techniques that allowed for standardized manufacturing