Sleeve.

[bighit]

Would the shock from the spring on the piston not smash the bottom of the plastic tube ? Delrin is a stronger than most of plastic these containers would be made of i would assume and PTFE too. The plastic used in the containers would be more brittle at the closed end .

[Phil Russell]

Would the shock from the spring on the piston not smash the bottom of the plastic tube ? Delrin is a stronger than most of plastic these containers would be made of i would assume and PTFE too. The plastic used in the containers would be more brittle at the closed end .

Yes. When I bought an EX88 new all those years ago, it had a plastic tube as a piston sleeve, sealed where it sits on the inside of the piston. When I stripped the rifle to correct a power issue (ott) I found the end of the tube had detached from the sides .. very neatly. I mentioned this to Air Arms at a fair (Midland??) and they sent me a new sleeve tube.
Cheers, Phil