Airgun Technologies Vulcan 3 burrs near the crown

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Oct 2, 2015
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Croatia
Hi all,

I have Vulcan 3 since March but I shot it only couple of times testing various pellets and slugs with mixed results, mostly bad.
Since I've put through it probably 10 or more different pellets and slugs from few different manufacturers, I thought it could benefit from a good barrel cleaning.

Unfortunately I've noticed burrs some 1/2" from the crown, probably tool marks when they made the crown.

Most of those I'll probably be able to polish out. I have VFG bore cleaning compound and it's quite a good stuff.
But, two are a bit bigger and those will not polish out with any paste,

What could I use to get out those bigger burrs?
They are not something unspeakable off but non the less, they are burrs which catch on pallets/slugs just before they exit the barrel and I believe that removing those would significantly improve on groups.

I live in SE Europe si I don't really have access to all the fancy tools and machinery and all pastes and compounds available to everyone else in the western world.

It's 700mm .22 cal, polygonal CZ barrel
 
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If the defects are what are generally regarded as burrs, or surface scoring across the lands, the proper fix is to chop and recrown.

J-B Bore compound on felts is not a good solution for damage of this sort. Not only is the abrasive too fine but the felt carrier cannot achieve any useful surface leveling on account of being compressible. A cast lap with a more aggressive abrasive would be the way to go, though for most DIYers this approach will rank a higher level of experience than a chop and recrown.

With that said, I would encourage you to try whatever approach you are comfortable with. The fact you’re asking for advice suggests you are conscientious enough to at least do no harm, and doing so will help build experience and confidence.
 
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nervoustrig said:
If the defects are what are generally regarded as burrs, or surface scoring across the lands, the proper fix is to chop and recrown.

J-B Bore compound on felts is not a good solution for damage of this sort. Not only is the abrasive too fine but the felt carrier cannot achieve any useful surface leveling on account of being compressible. A cast lap with a more aggressive abrasive would be the way to go, though for most DIYers this approach will rank a higher level of experience than a chop and recrown.

With that said, I would encourage you to try whatever approach you are comfortable with. The fact you’re asking for advice suggests you are conscientious enough to at least do no harm, and doing so will help build experience and confidence.
Click to expand...
The world needs more folks like you who are so knowledgeable, generous and positive.
 
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I have made a lot of recrowns of my rifles with this:

IMG_3057-1.jpeg
 
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Thank you all for advice!

Helpful info and insights!

Chop and recrown is within my ability and machinery access but in that case I would also need to shorten the shroud since Vulcan shroud configuration is dictated by barrel length protruding out of the block. I'll leave that for the second attempt if polishing the burrs fails as a first approach.

I'll post back what I've done and how but that has to be followed by test shooting to see if I've done good or a bad job.

Unfortunately, weather is terrible last few days and will continue in the same way next week. After that I won't be home for two weeks. Work away from home. So, it will probably be a month before I do any work or test shooting.

Where I live there are no indoor ranges so I'm at a mercy of weather conditions which are not good at the start of autumn.
 
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