Quote Originally Posted by gingernut View Post
It might!
I should have clarified that these two guns have had the transfer plate in front of the valve removed as well.
So your hammer with the screw in is hitting the valve hard and direct.
The difference would be quite clear if you shot one of them!
Wait and see.If it wrecks the gun I will let you know.

But other Umarex models hit the valve direct.
The transfer plate on the Colt is to make the grip safety work-badly.

I should also make the point that these mods take you nowhere near the legal limit.
They just make the gun work better.
Ah, Nick (Magicniner) took out the transfer plate when he pinned the grip on mine and fitted an ali backstrap and beavertail. Must admit I am lacking a chrono at the mo so have never checked the FPS, although after the tune up its seems to hit harder (although I'm never bothered about getting near the legal limit- I have a Crosman Mk1 for that )