Mounting location of rings on picatinny ( forward vs rear)

[Elgreco]

Hello,
I realize that in a powder burner they advise to tighten the rings pushed up against the slot towards the muzlle to account for the rear wards action of the rifle. In pcp rifles I guess it doesn't really matter. But what about gas ram or spring air rifles where the rifle goes rearward at first but then once the poston hits the rifle moves forward thus pushing the scope back towards the shooter? I have thought on such rifles to mount one ring pushed forward and the other towards me? What says you?

 

[Sqwirl57]

On springers they get mounted rearward in the slot

 

[my87csx481]

Yup, rearward on a springer. The recoil from the piston stopping is greater than the recoil when the piston is released.

Also, I've seen it suggested (for powder burners), to mount one ring forward, and one ring rearward....one forward for recoil, one rearward to prevent accidental movement from getting bumped/abused.