you will get recoil in a pcp as you do in any gun when you pull the trigger you cause an action that is the hammer being pushed by the hammer spring the momment it hits the valve stem it stops you would not be able to see this it happens to quick then you get the blast of air that air stops mommentarily till it opens the pellet skirt to shove it down the barrel try putting your cocked pcp on a table pull the trigger and watch it jump even without a pellet in it.

Paul