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PostPosted: Sat Dec 14, 2013 7:23 pm 
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Joined: Sun Aug 18, 2013 11:08 am
Posts: 2
First off I want to thank everyone for sharring your knowledge and experience. It helped me choose my first airgun purchase in 30 years.
I recently bought a AR 2078A from a Canadian retailer and am very happy with the rifle.
I'm in the process of squeezing out as much accuracy as possible and I've found a small issue I hope someone can help me with.
The chamber appears it have a burr where the throat and the rifling meet.
How do I remove it? Short of buying a dedicated chamber reamer. Is their anyone that I can send the barrel to to have it recut? Is there a bit I can use to cut it myself? I have access to a lathe.
Thanks
Frank


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PostPosted: Sat Dec 14, 2013 10:01 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
tinker wrote:
First off I want to thank everyone for sharring your knowledge and experience. It helped me choose my first airgun purchase in 30 years.
I recently bought a AR 2078A from a Canadian retailer and am very happy with the rifle.
I'm in the process of squeezing out as much accuracy as possible and I've found a small issue I hope someone can help me with.
The chamber appears it have a burr where the throat and the rifling meet.
How do I remove it? Short of buying a dedicated chamber reamer. Is their anyone that I can send the barrel to to have it recut? Is there a bit I can use to cut it myself? I have access to a lathe.
Thanks
Frank


Welcome Frank.

Can you make a reamer of drill rod and prep the breech leade with that?
How I do it :)

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Walter


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PostPosted: Sun Dec 15, 2013 12:00 am 
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Joined: Sun Aug 18, 2013 11:08 am
Posts: 2
Thanks Walter. Would you have a print of the reamer? Do you think a pilot would be necessary?
Frank


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PostPosted: Sun Dec 15, 2013 1:11 pm 
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Joined: Fri Sep 09, 2005 11:55 am
Posts: 231
Location: England.
Spin the barrel up in a lathe about 40 to 80 rpm and run a 1 in 14 taper reamer down. Just check for depth.

The cheap reamers will get you by but if doing more than one lash out for a quality jobby ie £40 cheap £7

If you bored the lead in it usually leaves a burr.
Other than that sand the burr out.


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PostPosted: Sun Dec 15, 2013 1:45 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Jon wrote:
Spin the barrel up in a lathe about 40 to 80 rpm and run a 1 in 14 taper reamer down. Just check for depth.

The cheap reamers will get you by but if doing more than one lash out for a quality jobby ie £40 cheap £7

If you bored the lead in it usually leaves a burr.
Other than that sand the burr out.


This is a QB barrel. You cannot use a taper reamer.

Make one of drill rod silver steel and good to go.
I'll get pics later....

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PostPosted: Thu Dec 26, 2013 8:53 pm 
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Joined: Tue Aug 20, 2013 8:56 am
Posts: 1079
Location: Calgary, Alberta
I just used riffler files to clean all the edges on my 2079. After that, I rolled 2000 grit wet/dry sandpaper into a tight roll and removed the scratches left by the files.
Just go slow and take your time and you will achieve the results you are looking for.

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PostPosted: Sat Dec 28, 2013 2:45 pm 
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Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
Hi there had the same problem with my qb78 I used a long reach bull nose reamer in a tap wrench, just rotated the tap wrench slowly and hey presto the gun will print clover leafs at forty yards. will post pic of said items


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PostPosted: Mon Dec 30, 2013 2:16 pm 
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Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
Pics of qb78 chamber burr removal rig hope this helps


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