Tuning FX Impact barrel tensioner and sleeve

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I made a collar that uses my shroud to tension my barrel. I did it before I even shot the gun because I have zero faith in a barrel supported almost entirely by orings and a grub screw. My concerns didn’t revolve around accuracy. We know that FX rifles and their springboard barrel systems can shoot very well. It was more about durability and consistency.
 
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I didnt manage to fit the carbon fiber sleeve in the liner( wrong dimensions) but I installed a cf tensioner between the shroud and the action plus a cf all around the shroud. I cant say if it is shooting more accurate ( already I was happy with accuracy) but I can confirm that with this stiffer barrel I dont have changes in the point of impact even if I lift the gun many times from the barrel or if store it with the barrel touching the wall.So yes .This improvement does worth for me .
 
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Theoretically, from engineering standpoint, tensioning a barrel won't bring noticeable difference, I am more convinced that it is a simple placebo effect.

Tensioning a sleeve is a different ballgame. Either you go with fully free floating on orings or you go full 1" thick steel tube.

Nothing is wrong with floating sleeve other then people complaining the orings move when you swapping sleeves.

Easy to fix that one to...next time you take the barrel apart wash all metal parts with acetone, mount 3 absolutely dry orings on the sleeve other then to node points, apply silicon grease not to orings but only to inner wall of the barrel tube...Done...orings won't move next time you pull parts apart.

I am a firm supporter let the sleeve tube oscillate in its own natural frequency.
 
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Oscillating in it's own frequency is not a problem but flopping around every time it is touched or leaned up against something is. Putting a barrel sleeve under tension can definitely make it more stable so banging it around a bit would not cause the poi to drift as much. This is really a problem with some guns and why barrel bands, as evil as they are, are also often used.

Both of these methods can increase accuracy sometimes by inches at fifty or sixty yards. When they are not actually needed or applied incorrectly they can also decrease accuracy.

https://www.airgunnation.com/topic/barrel-bands-do-work/?referrer=1
 
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Yes, I understand the concern, but, me in example I don't throw my Impact at the rear of a pickup truck/SUV, I never drop it and never pickup the gun by the barrel and not leaning it against a wall. I am taking well care of it and always sitting in a well padded custom case.

Replaced all the barrel floating orings to Buna90 and not crazy tightening the setscrew in the rearblock, not hanging the radar from the shroud and not giving it to my wife to use it as a coat hanger...

So far I have no problems as some isolated cases claiming, but again ...I can see where may be some improvements.

Again in my case the Impact is not a tool...but a toy.
 
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I have limited experience with my Impact as it's less than a month old and the weather hasn't been the best so I can't comment on whether or not I have experienced any POI shift. I did order one of Ernest Rowe's carbon fiber tubes for the liner and will use it as I think it will not hurt accuracy in any way. I treat my stuff very well and my guns with kid gloves. That being said, the carbon fiber shouldn't hurt if I accidentally bump the barrel.
 
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I'm no engineer but I thought it was either tension "pulling or streching", compression is "pushing or squeezing" together?

The idea of a carbon fiber sleeve would just add stiffness to the barrel to resist flexing? which I believe FX could do by just making the liner or barrel a larger Diameter. doesn't the original style of compression nut actually use compression forces?

I have the super light system with no compression nut.


 
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IMO, I'm concerned about the difference between the coefficient of thermal expansion of the cf tube and the steel barrel. As temperatures change, each of those will grow at a different rate causing POI shifts. Even bone stock guns have to be zeroed each time you go to the range. They all change a few clicks in one direction or another. That's a fact of life. I think I'll skip these things.
 
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IMO, I'm concerned about the difference between the coefficient of thermal expansion of the cf tube and the steel barrel. As temperatures change, each of those will grow at a different rate causing POI shifts. Even bone stock guns have to be zeroed each time you go to the range. They all change a few clicks in one direction or another. That's a fact of life. I think I'll skip these things.
Click to expand...

Carbon fiber has very little thermal expansion from the (limited) research I've done on it. If the liner has been bonded to it and it's a snug fit at room temperature, I wouldn't worry about the liner expanding inside the carbon fiber tube in the hot sun.
 
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Yes, I understand the concern, but, me in example I don't throw my Impact at the rear of a pickup truck/SUV, I never drop it and never pickup the gun by the barrel and not leaning it against a wall. I am taking well care of it and always sitting in a well padded custom case.

Replaced all the barrel floating orings to Buna90 and not crazy tightening the setscrew in the rearblock, not hanging the radar from the shroud and not giving it to my wife to use it as a coat hanger...

So far I have no problems as some isolated cases claiming, but again ...I can see where may be some improvements.

Again in my case the Impact is not a tool...but a toy.
Click to expand...


I did have a little POI change now and then before I, like you, put the Buna 90s on but it is soo.. tight with the tensioned barrel now that that POI shifts just don't happen even when the gun is treated roughly. I was also speaking in general about the barrels not just for the Impact.
 
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