Barrel liners ?

Forums PCP Airguns Barrel liners ?

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    Bluestone
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    Announced recently for the FX Crown. I’m not familiar with barrel liners. If it’s not too dumb a question, how do they work ? 

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    Regal_US
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    Relining is typically used to extend the use of fire arms, without the cost of a new barrel. Basically, the old barrel is drilled out, and a new thin wall barrel with rifling is slid into the old barrel, and then either soldered or glued into place. What FX have come up with is to fabricate barrel ‘exteriors’ without any rifling, into which you can insert liners with different rifling, and I guess different calibers.

    I guess the cost will be less than a set of conventional barrels, and will allow you to match twist rates to a specific pellet weight and geometry. In principle its a great idea. The big question is how will the liner be held in place, so that it does not move and change aim point every time the liner swapped out. Obviously it won’t be glued in since this will defeat the purpose of easily swapping liners

    Here’s a link to a great video showing how a fire arm is fit with a liner.

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    Bluestone
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    Thanks for that. 

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    T3PRanch
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    In the case of the FX offering they screw into the outer barrel and can be changed in seconds. $99 per liner is the announced cost!

    Thurmond

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    Deleted Account

    Hello Thurmond,
    Any idea if we will be able to retrofit this new barrel with the liners on any other of the FX air rifles? And second question: have you heard anything about using one of these .22 STX barrel liners with cast lead bullets as opposed to just pellets? Maybe we could retrofit a Huben and a Kral with this new barrel system also…? 
    Best regards, Chuck

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    X27
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    Watch this

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    Deleted Account

    Wow not just the ability to change barrels and calibers… but we can now change to a faster or slower twist rate depending on whether or not we are shooting longer bullets or shorter pellets! 

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    Saltlake58
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    Chuck said – “Wow not just the ability to change barrels and calibers… but we can now change to a faster or slower twist rate depending on whether or not we are shooting longer bullets or shorter pellets! ”

    Way too complex for me.  Just let me have one gun with multiple calibers and I’m happy.  Adding twist rates is definitely for the brainier of the shooters here, which, I’m afraid, leaves me out.

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    Deleted Account

    Hi Saltlake58! I lived in Murray for a few years once upon a time… I remember the T-shirts at the time that said “Welcome to Utah, turn your clocks back 25 years!  🙂 All the jive regarding twist rates is really very simple… it amounts to the proven scientific fact that shorter projectiles need a slower twist rate to be stabilized in flight, and longer projectiles need a faster twist rate to stabilize them in flight. 

    So how could this possibly apply to you someday? Well lets say you have a .25 cal. air rifle that shoots the JSB 25.4 grain pellets super accurate…and these are about 7 mm long. Then at some point you decide you want to shoot the 43 grain Eun Jin pellets for hunting game larger than squirrels…and these measure 11 mm long. Then lets say the barrel that shoots the JSB 25.4 grain pellet so well has a twist rate of 1-18″ or 1-20”. I can guarantee you that the Eun Jin 43 grain pellets will not shoot very accurately out of that barrel at distances like 50 yards or farther because they need a barrel with a rifling twist rate of 1-16″ lets say. How do we know this? Well this was all figured out many years ago by people smarter than me, but I will give you an example: A standard .22 long rifle bullet weighs 40 grains, and is 11 mm long, and is shot out of a barrel with a rifling twist rate of 1-16″, and it will shoot these bullets fairly accurately at 50 yards. But if we shoot a .22 Short in this same barrel it will not shoot accurately at 50 yards. Not because it shoots a lighter 27 grain bullet but because the .22 Short bullet is much shorter than the other one, thus it requires a twist rate of 1-20″ or even 1-24″ to be accurate. 

    One of my points is that the old adage “one size fits all” does not apply to barrel twist rates. Now Fredric Axelson knows that most of us are not familiar with all this, so he says that he is going to supply barrels with varying twist rates and match them to the pellets or bullets that shoot best out of them. (He says he even has a barrel with a 1-8″ twist rate now…I guess for shooting 5.56?)  🙂  Which means he is pretty much going to do most of the work for us and get us pointed in the right direction, and then we can experiment with various pellets and projectiles as we please.  One example of this is that a few years ago I set up one of my .25 cal. Sumatra air rifles to shoot the 49 grain flat nose cast lead bullets from Hunter Supply, in one of my barrels that had a twist rate of 1-16″ that gave me an average of 108 ft/lbs of energy at the muzzle. That barrel shot these slugs and the Eun Jin 43 grain pellets both very accurately, but it would not shoot the JSB 25.4 grain pellets worth a darn. So I ended up with two Sumatra’s…one with the slug barrel and one with the standard 1-18″ twist factory barrel for shooting pellets. 

    But thanks to Frederic Axelson we will no longer need to own more than one rifle… we can just buy the appropriate barrel to shoot the projectile we require for whatever specific purpose we have in mind. And as an added super extra bonus we can adjust our regulator pressure and hammer spring tension ourselves, to give a given projectile the correct velocity in which to achieve its optimum performance. I am sure a lot of guys will share their data on the subject here so that most of us will only have to follow directions on how to set up a Crowne one way or the other. I hope any of this helps you or someone else understand the basics of twist rates as applied to Fred’s new Wonder Gun.

    Best regards, Chuck

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    T3PRanch
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    @ chuck From the brief conversation between Fredrik and Ed when Ed told Fredrik that possibly he should buy barrels from FX I conclude that FX will be using their full production capacity for their new guns. It may be a “while” before the outer barrel and liners will be produced for other guns. I can certainly foresee the Impact getting the “upgrade” First since it is their current hottest seller! IMHO of course! ;)  I did hear Fredrik say something about longer projectiles so they ARE planning for slugs (cast bullets) in addition to pellet optimized barrels which thrills me beyond description. :) :)

    By the way his name is Fredrik Axelsson just to be accurate (that is what we strive for isn’t it?) :P

    Thurmond

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    Bluestone
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    “X27”Watch this

    
In addition to calibre and twist rate; choking is also mentioned as a customer defined requirement. In other words, bespoke barrels. Brilliant!

     

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