How it works: Winchester Model 21 is a free arcade game developed by Noble Empire for Android users. It is an interactive 3D model with animation that explains the function of the Winchester Model 21. The app offers a high detailed 3D model of the gun with operation animations like fire and reload. It also includes accessories such as sawn-off barrel and stock.

Moreover, the app offers various modes for an in-depth understanding of the gun's mechanism. These modes include slow motion, X-ray, cutaway, and Tap'n'Hide mode, which allows the user to hide any part of the model by just tapping it. Additionally, the app offers Augmented Reality (AR) mode, which lets users take AR photos using their camera.

Overall, How it works: Winchester Model 21 is an excellent app for gun enthusiasts who want to learn about the gun's mechanism. The app is easy to use, and the interactive 3D model with animation makes it engaging and informative.