It depends on how you disable the blowback
Also the reasoning to Spumping is to get the "Augmented" accuracy from the bolt being closed before it fires the ball..
If I understand properly you want to remove the striker o-ring and just re-cock it every time it doesn't cycle..
If you do it this way, there's more chances of affecting velocity from drag to hand miss-placement
Big Whoop, I'm spooning a Barrett .50 cal, I could kill... a building!!! - Sterling Archer Feedback