FX Crown MkII Superlite Barrel Liner/Shroud Spacers

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KodiakJac

KodiakJac

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Aug 22, 2023
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With the well documented problem of the Crown MkII Superlite barrel wagonwheel liner/shroud spacers being pushed back towards the breech when firing the Crown MkII there have been many solutions offered here to hold the spacers in place. And I saw a solution using a carbon fiber liner sleeve holding one wagonwheel spacer nearest the muzzle, but not using the other two wagonwheel spacers. With that said, here is my question...

Could you buy an FX carbon fiber liner sleeve and cut it into 3 sections, with each section being the correct length to keep its corresponding spacer from moving towards the breech?

For instance, it would be a configuration like this for the 700mm Superlite barrel...

carbon fiber liner sleeve/spacer/carbon fiber liner sleeve/spacer/carbon fiber liner sleeve/spacer

Still trying to sort out how I'm going to manage the wagonwheel spacers before I spring for a Crown MkII Continuum. You would lose the stiffening properties of the carbon fiber liner sleeve, but wouldn't it do the job of holding the wagonwheel spacers in place? Would there be a downside I'm not thinking of?

Thanks!
 
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No downside. I cut mine and bonded the liner with epoxy. Re-assembled the shroud while it set up, so everything would be nice and square with eachother. You can 3d print spacers to go ontop the liner as well so you don't have to cut it at all.

Courtesy of @danny5692 https://cults3d.com/en/3d-model/various/spacers-for-carbon-sleeve-fx-crown-barrel​


144966348_3876951552394948_4761830615413367284_n.jpg
 
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Long_Gun_Dallas said:
No downside. I cut mine and bonded the liner with epoxy. Re-assembled the shroud while it set up, so everything would be nice and square with eachother. You can 3d print spacers to go ontop the liner as well so you don't have to cut it at all.

Courtesy of @danny5692 https://cults3d.com/en/3d-model/various/spacers-for-carbon-sleeve-fx-crown-barrel​

Click to expand...

That's what I was hoping. And, I guess it wouldn't hurt to epoxy it and make everything permanent, as the only thing that would potentially need replacing might be the O rings on the spacers?

I don't have a 3D printer, nor know anyone who does, but the way you've done it sounds like a good option!

Thanks!
 
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Bigragu said:
Use Corbin clamps, one on each side of the spacer. Your spacer isn’t going to budge, guaranteed.

Click to expand...

That seems like a nice, simple solution, but the thing I would worry about, is would the extra weight of the Corbin clamps mess up the barrel harmonics?

And thinking this through, I guess I could skip the carbon fiber liner sleeve altogether and just use a dab of JB Wield on each side of the spacers. That would also be permanent. But thought I might add the extra benefit of the carbon fiber sleeve. Wasn't sure if cutting it would lose the stiffening, but if I epoxy it, that should give me the stiffening benefit also.
 
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Make sure the barrel shroud is clean, I used carb cleaner spray, careful , you are cleaning out lead, and then light oil on a 12 gauge shotgun bore cotton rod, then a light coat of silicon grease on the spacer o rings, and easily glide , slide , twist, and the spacers go right in nicely, and yes tape both sides of the spacers.

Yes on the 3d printing spacers for carbon sleeve, Is there a 22 caliber spacer available? Thinking that the 22 and 25 barrels OD are different, I can contact Cult3d and ask.
It is possible that the carbon tube od size is the same for both 22 and 25, as Ernest R has a machining process that is changing the ID of the tubes, and the difference on .22 to .25 is 0.030 on the diameter ,0.015 on the radius.


I just ordered the 22 heavy liner 700 and the carbon sleeve from UA. So this is an active project for me.
 
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Barrels appears that the 22 is a 8mm od, and the 25 is a 9mm od, 30 is a 10 mm. Still have the same question, what is the od for each of the carbon sleeve?
Might be possible to use fx spacers and order a size larger to accommodate carbon tube size increase? All depending on carbon tube sleeve od. Still searching. All this is the perfect reason to get a 3d printer.
20230901_093314 - Copy.jpg20230901_093348 - Copy.jpg
 
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alpineboard said:
Barrels appears that the 22 is a 8mm od, and the 25 is a 9mm od, 30 is a 10 mm. Still have the same question, what is the od for each of the carbon sleeve?
Might be possible to use fx spacers and order a size larger to accommodate carbon tube size increase? All depending on carbon tube sleeve od. Still searching. All this is the perfect reason to get a 3d printer.
View attachment 385323View attachment 385324
Click to expand...
Just so everyone on this thread knows, 910 Airguns who recently became Cape Fear Airguns, sells a pack of three spacers they are made to slide snugly over the CF liner sleeves. You just need to leave in the notes at checkout your caliber size.
Newman, the owner, suggests to superglue his spacers onto the CF sleeves for a permanent install, if you wish.
Great price, too!
www.capefearairguns.com

FX Superlight Barrel Bushing

FX Superlight Barrel Bushing Specially designed spacer to allow a FX Superlight barrel the ability to use a carbon fiber liner sleeve (3 spacers / pack) Models: Crown or Dreamline Fits all calibers if installed with the appropriate caliber CF sleeve. Fits all barrel lengths.
www.capefearairguns.com www.capefearairguns.com
 
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Reduces harmonic flexing of the straw-like liner. It's not needed but greatly curbs tune sensativity, and ammo pickiness. In my experience. I could only reason that bonding the liner improves it's function... makes the setup more rigid than installing it loose. Some of the liners are very tight going on.... some are not.... I don't know that there is a standard size for each caliber, but I can check both my .22's if yall want. They were purchesed from different batches some time apart from eachother.
 
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Long_Gun_Dallas said:
Some of the liners are very tight going on.... some are not.... I don't know that there is a standard size for each caliber, but I can check both my .22's if y'all want. They were purchased from different batches some time apart from each other.
Click to expand...

Yes, please do. It will be good information for everyone to have.

And for me, all this information has put the Crown MkII Continuum in .22 back at the top of my "next to buy" list. There are clearly good ways to hold the spacers in place.
 
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I believe from what I heard on Ernest Rowe, FX, and others commenting on youtube, that the carbon tubes ID are being machined to fit the OD of the barrels that they are being used on. That would make all the OD identical, or close to identical, depending on manufacturer.
This coincides with what Newman at Cape Fear emailed me, as I just ordered a set of spacer/bushings from him.
" Yes Sir,they are one size for all calibers, since the OD of the carbon tubes are the same for all calibers."
And therefore no need to specify any specific caliber.
 
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I wasn't sure if the ID of the steel liner tubes were all the same. I have a .30 cal barrel with the old steel tube that the orings go into as well, but the other barrels either pre date or supersede that one in design (old smooth twist solid barrel, or superlight)

I'm guessing the tubes are 12mm ID, so the carbon sleeves should be as close to that as possible. 11.99mm is very good. He must have tightened up tolerances cause the earlier one was definitely looser.
 
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