Bad compression tubes

[Barryg]

Do other people get rifles with bad comp tubes?
When working on my own springers have found a few bad tubes: some have tight/high spots in the middel of the tube, and some have ridges down at the bottom that chew up piston seals.
I'm not talking about Chinese guns, but German and British guns that are supposed to be good; a HW80 had a sharp ridge at the bottom, several Supersports seem to be oval and leak lubricants past the seal, a Tx200 with bulges, and the list goes on...

Do other people get them too, or is it just me?

The only one that I can remember is a Mk 2 Airsporter.

Are the guns you are talking about new or S/H I wouldn't be surprised if AA would put the TX right.

[frogboy]

Yes.

I decided to undertake the sleeving of a HW80 to take a 25mm piston. EdBear took the cylinder and cut a piece of aircraft grade tubing to fit, Ed having made a couple of these conversions in the past, he measured the depth and referred to another tuners guide on the web as to the correct length. He returned all the bits to me saying that it was ready for me to fit together, he wasn't doing it as it was a one attempt try and if it went wrong, it would probably result in a scrap cylinder.

I checked the depth and it seemed to match the sleeving tube length. Locktite in the cylinder started to push the sleeve in and it went solid with about quarter of an inch to go, whatever I did it wouldn't move. I took it back to Ed who after much swearing at my incompetence took it away. I saw him the next week at bell target with one cylinder that he had welded a home made extractor through the cocking slot, heated the cylinder to break the locktite and removed the sleeve.
He had then measured the internal diameter and found that the last quarter of an inch was tapered, preventing the sleeve from reaching the bottom of the cylinder.
He also had fitted a new sleeve into the cylinder, allowing me with a little help from BTDT to finish the job.

So yes I have had a similar experience, and it was nearly a costly one

[mrto]

I have a BSF B55 the cylinder of which is pinched at the point the stock mounting lugs are welded to the cylinder.The gun shoots fine with a synthetic parachute seal which is flexible enough to compensate for the pinch at that point in the cylinder, following the contours of the irregularity.I don't know if this is common to all B55's.

I do know the overall build quality of the B55 does not live up to the legend!

[Papa g]

I have a BSF B55 the cylinder of which is pinched at the point the stock mounting lugs are welded to the cylinder.The gun shoots fine with a synthetic parachute seal which is flexible enough to compensate for the pinch at that point in the cylinder, following the contours of the irregularity.I don't know if this is common to all B55's.

I do know the overall build quality of the B55 does not live up to the legend!

Yep I have the very same thing with a BSF 55, and a problem with an anshutz 335 mk1 where the name is stamped on the cylinder
Regards Graham

[hmangphilly]

Yep I have the very same thing with a BSF 55, and a problem with an anshutz 335 mk1 where the name is stamped on the cylinder
Regards Graham

I suppose it didn't matter so much back in the day . The floppy old seals would sort of forgive the lumps and bumps .

It's poor practice though . The design engineer must have cringed .

[mrto]

Yep I have the very same thing with a BSF 55, and a problem with an anshutz 335 mk1 where the name is stamped on the cylinder
Regards Graham

That's interesting all B55's must be like it then and doubtless some other BSF models,too.I haven't ever stripped either of my 2 Annie's,but shall try and remember what you have said about the name stamp if I ever do!

Cheers,
Mark.

[Shed tuner]

the annie compression tube problems around the stamping are well known..