What innovative product development feature of the Winchester Model 1873 rifle made it particularly successful in both military and civilian markets?

The Winchester Model 1873 rifle is often called 'The Gun That Won the West' and represents one of the most successful product development stories in military history. After its introduction, this legendary firearm transformed warfare and civilian markets alike. This poll tests your knowledge about how product development in military technology influenced both combat tactics and commercial success during a pivotal era of American expansion.

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Its interchangeable parts system that allowed for field repairs without specialized tools
Its lever-action mechanism that allowed for rapid firing without reloading after each shot
Its ability to use the same ammunition (.44-40) as popular handguns, allowing users to carry just one type of ammunition
Its adjustable iron sights that allowed for accurate long-distance shooting without specialized training