Quote Originally Posted by deejayuu View Post
Only 'cos you haven't mentioned it. Beware the windows in the tube for trigger block etc. They can wreak havoc on seal lip when refitting.
A good smoothing of edges and consider thin sleeve to get the seal past them. Old film negative etc
Granny, eggs, and all that
This is the most important bit, i had an ongoing battle with my old bsa 635 magnum because i failed to notice a sharp burr on both sides of the cocking slot that was cutting two slits in the o ring everytime i fitted a new one.