How a Browning Auto-5 works

The Browning Automatic 5, most often Auto-5 or simply A-5, is a recoil-operated semi-automatic shotgun designed by John Browning. It was the first successful semi-automatic shotgun design, and remained in production until 1998. The name of the shotgun designates that it is an autoloader with a capacity of five rounds, four in the magazine and one in the chamber. Remington Arms sold a variant called the Remington Model 11.

https://en.wikipedia.org/wiki/Browning_Auto-5

Browning Auto-5: full disassembly & assembly
https://youtu.be/_fKXZ-R6jlk

Don't try to recreate what you see in this video, as this is gameplay. This video was created using the game World of Guns:
http://store.steampowered.com/app/262410/
This game is also available on Google Play, App Store, Amazon and other platforms.