I love computer animations that show how a firearm’s action operates. This video on the SVD Dagunov is narrated in Russian but you can definitely see how the gasses flow and hit the piston, push the operating rod back, and then operate the bolt and trigger. I think videos like this provide valuable insight into what all is going on.
This one is very detailed and fascinating. Definitely worth watching!
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at email@example.com.