HELP!!! B-40 Bore/Shroud problem???

HELP!!! B-40 Bore/Shroud problem???

Joined: May 13th, 2006, 10:07 am

January 16th, 2007, 4:54 pm #1

I just got a B-40. I was trying to clean the bore with my patch worm and it gets stuck at like the last inch or to from the end of the barrel.
I can with many tries get the patch worm down the barrel from the end but it is "Catching" on something near the end of the barrel. Once i get the string past this the patch goes thru fine.
What Gives?? is something out of whack.
I have fired 3 pellets just in my office into a pile of rags and the pellets seem fine. No real Abnormal damage.
I am concerned that the pellet might be catching something.
Sound Supressor??
Thanks
Mark.
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Joined: October 8th, 2005, 7:59 pm

January 16th, 2007, 5:30 pm #2

from several weeks ago. http://www.network54.com/Forum/113813/m ... 166808492/

There's a "hollow" section about 1 1/2" long between the external muzzle and the end of the actual barrel. The shroud is a tight slip-fit on the barrel and held on with some sort of very aggressive brown adhesive.

If you clean the barrel from the breech end as the rod/string leaves the actual barrel muzzle it hangs up on the inside of the hollow area formed by the shroud/end cap.

Bend a small hook on the end of a piece of copper or aluminum wire about 4" long and you can stick it into the external muzzle and feel the internal cavity.

Ed
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Joined: May 9th, 2005, 7:25 pm

January 16th, 2007, 7:30 pm #3

some of the newer B40s don't have a shroud tube.
They don't need any aggressive brown adhesive on
the new type barrel. It's all one piece.

IIRC, there are two small air holes at the breech
end of the TX200Mk3 shroud. I don't see them
on this new B40.

EDIT: Mind is melting! I did not recall correctly!
I think those two holes are actually in the barrel of another Air Arms.
My S400ERB..

Cheers,
Rich

Well at the time, it sure seemed like I was in hell.
Last edited by RLT59 on January 17th, 2007, 4:19 am, edited 1 time in total.
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Joined: February 2nd, 2005, 4:51 pm

January 16th, 2007, 11:07 pm #4

Why would they go to a solid barrel??????? I just got one from BestAirguns and it has a shroud. Wouldn't a solid barrel make it WAY to front heavy?

<font face="Comic Sans MS" size="3" color="blue">"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve. "</font><p><font size = "1" color="fafaa">PMS</font>
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Joined: February 2nd, 2005, 4:51 pm

January 16th, 2007, 11:16 pm #5

some of the newer B40s don't have a shroud tube.
They don't need any aggressive brown adhesive on
the new type barrel. It's all one piece.

IIRC, there are two small air holes at the breech
end of the TX200Mk3 shroud. I don't see them
on this new B40.

EDIT: Mind is melting! I did not recall correctly!
I think those two holes are actually in the barrel of another Air Arms.
My S400ERB..

Cheers,
Rich

Well at the time, it sure seemed like I was in hell.
http://www.network54.com/Forum/113813/m ... 887/Shroud

You'll see that they are mistaken about the shroud (which is what I suspected all along).

<font face="Comic Sans MS" size="3" color="blue">"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve. "</font><p><font size = "1" color="fafaa">PMS</font>
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Joined: May 9th, 2005, 7:25 pm

January 17th, 2007, 12:44 am #6

Not visible to my eye, but the seam shows up nicely on a close-up photo.


The plug goes into the 'shroud' about 0.6".

But, I don't see or feel any plastic baffles inside.
Reaching in with a wire (1/8" hook on the end),
there is nothing until I hit the muzzle about 2" down.
Shove the wire in more and it's just inside the bore.
It does not hang on anything after that.
(I can feel the rifling grooves).

It seems to me, they drilled out the end of a bull barrel
about 2" and installed a thick cap on the end.

The only thing that made me a little suspicious was when
I pulled out the little shock-absorber plug and stuck a
little screwdriver in the hole. It felt like plastic!

I could look down the bore of my TX200Mk3 and see the baffles quite easily.
I noticed them every time I cleaned the bore. I could feel them.
They don't seem to exist on this B40.

Cheers,
Rich

Last edited by RLT59 on January 17th, 2007, 4:23 am, edited 1 time in total.
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Joined: August 5th, 2006, 11:55 pm

January 17th, 2007, 11:11 am #7

The are almost smooth with a little rib. You won't feel much of them with a probe. I think that I threw mine away when I converted my lead collector or I would take a closeup picture. I didn't see much use for them other that maybe a ping dampener.

If the little plastic bumper is still stuck into the bottom of the shroud to stop the cocking lever, you might see a bump in the plastic tubing from the bumper tail piece.

In the picture, notice the 3 pieces of tubing standing on end.


I clean from the breech with a piece of heavy mono that I have split the end. It might take a couple of tries to clear the end of the shroud hole, but so far hasn't been much of a problem.


Right above the cocking arm end, notice the hole in the shroud where the plastic bumper used to be.


I don't use the plastic bumper anymore, I use a stop screw. The cocking lever is very solid when it is seated into the spring loaded ball.


Chris
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Joined: May 9th, 2005, 7:25 pm

January 17th, 2007, 1:27 pm #8

Those look like pieces of tubing standing on end,
they do not look like baffles.
The baffles in my AA S400 & TX look like washers
with a hole in the center.
I can't see how plastic tube is going to do anything
but take up space inside the tube.

I'm starting to think that the plastic tube is just
there to act as a holding device for the bumper pad.
When I shoved a tiny screwdriver into the hole, it
felt tight, like it was pinching the blade.

Cheers,
Rich

Well at the time, it sure seemed like I was in hell.
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Joined: October 8th, 2005, 7:59 pm

January 17th, 2007, 1:57 pm #9

Not visible to my eye, but the seam shows up nicely on a close-up photo.


The plug goes into the 'shroud' about 0.6".

But, I don't see or feel any plastic baffles inside.
Reaching in with a wire (1/8" hook on the end),
there is nothing until I hit the muzzle about 2" down.
Shove the wire in more and it's just inside the bore.
It does not hang on anything after that.
(I can feel the rifling grooves).

It seems to me, they drilled out the end of a bull barrel
about 2" and installed a thick cap on the end.

The only thing that made me a little suspicious was when
I pulled out the little shock-absorber plug and stuck a
little screwdriver in the hole. It felt like plastic!

I could look down the bore of my TX200Mk3 and see the baffles quite easily.
I noticed them every time I cleaned the bore. I could feel them.
They don't seem to exist on this B40.

Cheers,
Rich
for the correct info on this.

Just like you, I thought the barrel was one piece. It is not. The end plug in the shroud seems to be installed before final metal finishing and blueing, so the joint is nearly invisible.

Do NOT attempt to remove the shroud unless you have a VERY good reason to do so. In my first attempts to remove mine I damaged the barrel crown, so I HAD to get it off to repair the damage I had caused. Not the fault of the gun, I did it all myself.

Ed
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Joined: August 5th, 2006, 11:55 pm

January 17th, 2007, 3:06 pm #10

Those look like pieces of tubing standing on end,
they do not look like baffles.
The baffles in my AA S400 & TX look like washers
with a hole in the center.
I can't see how plastic tube is going to do anything
but take up space inside the tube.

I'm starting to think that the plastic tube is just
there to act as a holding device for the bumper pad.
When I shoved a tiny screwdriver into the hole, it
felt tight, like it was pinching the blade.

Cheers,
Rich

Well at the time, it sure seemed like I was in hell.
Mine has washers now

I never did figure out a use for the tubing.

As Ed has posted below and with good caution, leave it alone or be prepared for the outcome.

I have been into my B40 so much that the screws jump out of the stock without even touching them. I think they are communicating, here we go again! .

I think there are only two pieces and I am not even sure about that, that I haven't fingered. I really enjoy the B40 and it is so accurate and smooth.

Have Fun!

Chris
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