Quote Originally Posted by Barryg View Post
Does your full length TX have a tight cocking shoe?
The seal's last longer with the correct amount of play in the shoe
Opposite problem. Too much play. With 2 fresh o-rings it needs 2 shims to seal properly and bring the power up. After a few months (I would guess 3-4k pellets) power starts dropping off again.
Changed to a one piece seal like the weihrauch now. Hopefully it does better