Which product innovation for muskets gave American soldiers a significant advantage during the Revolutionary War?

During the American Revolutionary War (1775-1783), firearm technology played a crucial role in determining battlefield outcomes. The British 'Brown Bess' and American-modified muskets represented different approaches to product design and innovation that directly impacted military effectiveness. This poll tests your knowledge about how product development in military firearms influenced one of history's most significant conflicts.

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The rifled barrel, which greatly improved accuracy at longer ranges compared to smooth-bore British muskets
Bayonet attachments, which were exclusively used by American forces
Percussion cap ignition systems, replacing unreliable flintlocks
Mass-produced interchangeable parts, allowing for field repairs during battle