Quote Originally Posted by robs5230 View Post
You'll affect the nice soft shot cycle by shortening the barrel.
You'll lose power and have to make it back up with more preload on the spring.

I'm sure you're aware but the 99 will need a little minor surgery to prevent it galling too.
Not always the case Rob, neither of mine have suffered with it, or needed work to prevent it. There is a South African member on another site who's chopped the barrel on one of his 177's to 10" & says it has no probs making the right power, i think he said 750fps but didn't say with what weight pellet.

Rob