Dropped my TJ barrel off last Friday to a machine shop and just got it back today. I think he did a great job at a good price. Looking forward to trying it out.
New .25 Avenger Barrel
- Thread starter revenger
- Start date
I'm assuming I will just with the added length of the barrel. The barrel port looks to be a little more efficient as well. We will see.
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Done by a 72 year old machinist who makes a lot of barrels for other platforms. So I guess he isn't a gunsmith but just more of a machinist. As far as the shroud I am going "shroud less". So the stock shroud is 25mm in diameter. The barrel is 1/2" OD. So I am going to epoxy successively larger tubes of carbon fiber together over the barrel to the 25mm mark so I can still use my barrel band.. that is why I had him thread the actual barrel for a moderator instead of using the Donny FL adapter that I have. There will basically be 11mm of carbon fiber/epoxy encompassing the barrel for ridiculous rigidity. It will essentially be a carbon fiber bull barrel, haha. Yes I know this is excessive and ridiculous for a $300 gun but it's fun. Maybe I will find something in the process.
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Looks like he's been learning lots over the years and applied it all to your bbl. Carbon fiber will be a good idea, since it'll be longer than stock. You'll also get the bonus of the CF being a guard against scratching your nicely machined barrel.
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The 1/2" barrel itself will be plenty ridged without carbon fiber.
While the shroud was 25mm the band id is 26mm. There should be two little grub screws to adjust the shroud position inside the band..
I believe your machinist knows what he's doing for concentricity.
While the shroud was 25mm the band id is 26mm. There should be two little grub screws to adjust the shroud position inside the band..
I believe your machinist knows what he's doing for concentricity.
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The barrel band just there to help support the long barrel from POI shifts. I ordered some 28mm heat shrink tubing that is somewhat stronger than standard heat shrink as well. I did this for my maverick which is getting a barrel band shortly.. the new bullet central tensioner shroud is 1mm smaller than stock shroud so I'm going to use heat shrink to adjust clearances.... Long story short I may do the same with the avenger bottle/barrel band to keep a tight fit.
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Big and as fast as it will possibly shoot lol. The gun before would do 80+ FPE with stock barrel and 43.2 grain Seneca pellets. Would do over 70 FPE with jsb 33.95's. however it didn't shoot slugs well at all. I'm hoping the TJ barrel will shoot pellets good but also have a few favorite slugs. Would like to produce 75+ FPE with slugs if possible.
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Well here are a few photo assemblies. Barrel band is just on for effect until I have all my carbon fiber tubes put on. Also I will probably use my Huma mod 40 with one of the sections out to shorten it a touch. I think it's gonna look good all done. Also don't mind the one scope mount... I broke the dang bolt and had to put a machine screw through it for time being.
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It has also occurred to me that perhaps I may come up with something to tension the barrel lightly. I may take some 1/2" x 1" (roughly 25mm OD) stainless washers and epoxy those to the ends of my carbon fiber tube assembly. In doing so I could have a finished and yet hard surface to possibly use the moderator to tension the whole system just a little bit.
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It appears the barrel did pick up some speed with jsb heavy pellets. First time the gun has ever went over 1000 fps with these pellets.
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I have. From my experience taking gun apart it will suck to get to and nobody makes parts for it. The stock spring is actually really stout. Not sure on the actual hammer weight though. The easiest way to adjust more power from the valve is by using a lighter valve return spring. I do have a lighter one in there and I have a couple lighter ones as well. I did have one that was pretty light at one point but the gun seemed more inconsistent so I put a slightly heavier spring in which made overall less power but was much more consistent. I think now I am at the point where I would have to make custom parts for it to keep gaining power. But the point of the barrel was really to shoot slugs so hopefully I can get some time to shoot slugs soon.. but right now the jsb heavies at 1000 fps are nearly one hole at 30 yards. Impressive so far.
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Yes had success with several slugs. It's all a balance of how much power you want to make vs which slug works best in your barrel.
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