Barrel tensioner/shroud

[7Green]

Bullet central and their shroud/barrel tensioner got me thinking because I like the way they look and I would love to have a stiffer barrel on my 35 cal impact.

The barrel on the 35 cal is nearly 14mm and the shroud is 28mm. Aquiring the end parts to epoxy in is the issue, at least for me. So if anyone has experience in putting together one and aquiring parts, let me know as I would be interested in building one.

While looking at the bc version, I wondered if the tension would loosen over time and from just handling the gun. If a different style end cap, where the shroud tapers down to the carbon fiber barrel piece was used near the block, perhaps a cyclindrical aluminum c type clamp could be machined to connect the block with the shroud taper piece to more permanently hold the tension.

 

[ram2jeep]

Is the tensioner/shroud available yet? I checked their website and when you click on the item it doesn’t work.

 

[7Green]

Last time I looked, it showed out of stock. I am also unsure if it is built to fit the 35 cal or not.

 

[7Green]

I was more referring to building my own because it doesn't look all that complicated.

 

[ram2jeep]

I was more referring to building my own because it doesn't look all that complicated.

Understand, perfectly now. The .35 has been a sore spot for me with FX. I’ve been waiting for that slug liner since they introduced the .35 and was even told it would be out “soon”. Then it was by the fall and that was last year.
Finally I see one of their tester’s videos and still nothing. So I switched the M3 to a .30 and power tuned it and that’s where it shall stay for a while at the least.

 

[7Green]

I agree, they have been slow as mollasses. I previously had really good accuracy with 93 grain nsa slugs in the 860fps range. With my new mods I can sling them 960-970 + fps.

Groups turned into a couple inches at 50 yards though. I still need to retune it, but the whole tensioned barrel and shroud idea got me thinking that maybe tighter groups are possible at higher speeds if the barrel was stiffened up.

Plus I like the look of carbon fiber more than the matte black aluminum shroud.

 

[7Green]

I use mine for hunting coyotes and turkeys mainly. I like the thwap a 35 cal slug puts on them when it hits them.

I know smaller calibers can do the same thing and dead is dead, but man it packs a wallop.

 

[7Green]

Does anyone know the various pitches on the air stripper side/ shroud points on the 35 cal?

M18 x 1mm is the shroud side I believe, but what about the other?

This is the idea for the block side. Reduce from 14mm x 20mm and 25mm x 28mm. Then a c type or tubular clamp can be placed between the fitting and the block to lock it down after the threaded tension is applied. Plan is to thread it on like the bc setup, but permanently hold the tension after.

 

[7Green]

Or even something like this would be pretty stout on the black side

 

[7Green]

Then a tube or clamp similar to this to go over both ends and lock them together. Obviously the carbon fiber will be in there over the barrel tube, but you get the idea.

 

[7Green]

Then the air stripper thread pitch and setup is what I don't know.

 

[7Green]

I think the valve adjuster knob may be in the way for the clamping idea. Now that I look at it closer.

 

[7Green]

Looks like fx has a similar idea.

 

[7Green]

This is thread pitch I am curious about. Any ideas?

 

[LSRHokie]

Just snapped a couple pictures for you.

that's 1/2"x20

Transfer port thread is 13x0.5mm

 

[7Green]

Awesome, Thanks.

 

[7Green]

Do you happen to know the od of the 35 cal liner? 12mm?

 

[LSRHokie]

Right at the muzzle i'm getting between 11.83mm and 11.86mm. Thats due to the rifling impressions. 12mm ID is a nice "loose" fit that will give you enough room for some JB weld between the two and make it solid.

 

[7Green]

Sweet, do you think I could thread and epoxy the transfer port to the tube as well as the opposite end the shroud thread on to?

 

[7Green]

I believe it was 13 x .05 on the shroud end and the tranfer port end...I have to find it in the thread again...doh