How a Gewehr 1888 works

In 1886, fifteen years after their defeat by German forces in the Franco-Prussian War, the French Army introduced the new Lebel magazine rifle firing an 8 mm high-velocity projectile propelled by the new smokeless powder. This made Germany's rifle, the Mauser Model 1871, obsolete due to its large and slow 11 mm round propelled by black powder. The practical result was that the French rifle had greater accuracy and range, giving French troops a tactical advantage over the German Army. In response the German Army's Rifle Testing Commission developed the Gewehr 88 which was adopted for service in 1888. For this reason the Gewehr 88 is also known as the "commission rifle," or "reichsgewehr".

https://en.wikipedia.org/wiki/Gewehr_1888

Gewehr 1888: full disassembly & assembly
https://youtu.be/8iLm7PbbJ9M

This video was created using the program World of Guns: Gun Disassembly:
http://store.steampowered.com/app/262410/
Also, you can find this application on Google Play, App Store and Amazon.

Видео How a Gewehr 1888 works канала Si vis pacem , para bellum.