Who has detailed Information about this "vintage" Feinwerkbau Anti Recoil System

[^^artin]

Recently I became interested in this old fashioned Feinwerkbau Anti Recoil System from the pre PCP springer gun aera.



I'm thinking about building something similar into a modern springer gun but can't find much about how it's done exactly.
Do one of you guys know this system in detail ? Is it a passive system just working like an improved artillery hold or is this action more complicated ?

As I know the whole system is sliding on 3 pins and gets reset by the charging lever after each shot. But that's almost all I know about it.

Greetings Martin

[Motorhead]

SLED ... become the basis for the FAMOUS FWB 300 10 meter rifles.

[Hllrsr]

Re-assemble the url for a video explaining it.

www youtube.com/watch?v=XU_qk14HHQo

Iain

[^^artin]

Thanks - yes, I discovered this video allready but I'm still not sure how exactly this works.
In most videos I can see that the whole upper system slides back when shooting. In some videos it also slides a bit forward again afterwards like if the sled slides almost free on the rail pins. In some videos/images I can see a tension spring attached to the sled.
I wonder if the sled is locked in the forward position and get unlocked by the trigger just slightly before the shot ? Without a lock the sled would possible slide out of the forward position just by tilting the gun upwards.
Also I like to know if the slide is driven by a additional spring or just by the recoil and inertia ?
I could imagine a very simple design with two soft springs, the one in the front somewhat stronger then the rear one, holding the sled barely in the forward position.
But to hold the slide properly when shooting upwards e.g. this springs can't be as soft as one could wan't them to be to properly cancel the recoil.
And if it was done with two springs in the original system it would act differently from what I can see in the videos. The sled would then automaticle reset itself to forward position.

Questions over questions    
 

[Motorhead]

In the FWB guns the sled DOES NOT have a lock and is reliant to the action being fired fairly level.  extreme up or down angles had an adverse effect on them working as designed.

[^^artin]

Hello Motorhead
Thank you, that helps a step forward.
If the sled doesn't get locked there's presumably also no additional spring to drive the sled forward.

[Motorhead]

Hello Motorhead
Thank you, that helps a step forward.
If the sled doesn't get locked there's presumably also no additional spring to drive the sled f
 based upon NEWTONS third law of physics .... equal and oppasate reaction

Hello Motorhead
Thank you, that helps a step forward.
If the sled doesn't get locked there's presumably also no additional spring to drive the sled forward.

Newtons third law of physics ..... Equal and opposite reaction.   
The sled is a passive devise that simply absorbs the energy of the cyclic recoil by allowing the action to move independent of the stock. with the mass of the action, weight of typical pellet shot the sled is allowed to travel X far and in doing so what you feel as the shooter is very close to recoil-less ... tho in reality not the case at all.