Quote Originally Posted by jonnyone View Post
Ive read that in some instances where the rifle has been unused ofr extended periods and the innards dry- this can lead to the piston head becoming perished and break down.
What Dave said. I'd renew the piston seal if the recoil was scope-wrecking.

Also, if, in still air, you load the rifle, put a pile of talcom powder over the breech block/cylinder end block join, and take a shot, you'll know whether the breech is leaking.