Inside my new Criterion barrel

[RODSTRADLEY]

Just cleaned my new 6.5 Cm barrel twice with nylon brush and patches with Butch's bore shine and here are the results. I think it is lead? I have written Criterion and no return from them but I haven't given up on them. After the 3rd and 4th time with a bronze chamber brush it looks a lot better. Is it lead from lapping or what?

 

[Mram10us]

Sometimes that is the cleaner left in there reflecting and looking like slime. I'd spray with brake cleaner and dry patch out well. I borescope all mine and they look that way when I haven't got them dry enough. Then it sticks to the borescope mirror and it's obvious what it is. Good luck

 

[milo-2]

I retract my post. I just peered into a new Krieger freshly chambered with my Hawkeye, the Teslong is at a friends so I can't snap pics.
Clean, yours looks better than mine.

 

[RODSTRADLEY]

No it has never been fired so that is not it, I still think it is lead from lapping.

 

[shinbone]

You suspect lead from lapping - Was the barrel lapped after it was chambered? I asked because whatever that material/residue is, it is in the throat and leade, and I thought barrels were usually lapped before being chambered.

 

[Creedmoor shooter]

It looks like oil or solvent of some sort left behind. I currently shoot a criterion and have a brand new barrel sitting at home. I'll borescope the new one and see what it looks like.

 

[RODSTRADLEY]

You suspect lead from lapping - Was the barrel lapped after it was chambered? I asked because whatever that material/residue is, it is in the throat and leade, and I thought barrels were usually lapped before being chambered.

I thought so too but I will find out.

 

[RODSTRADLEY]

I thought so too but I will find out.

Michael from Criterion said lapped before clambering. So tonight I will take another look

 

[RODSTRADLEY]

Sometimes that is the cleaner left in there reflecting and looking like slime. I'd spray with brake cleaner and dry patch out well. I borescope all mine and they look that way when I haven't got them dry enough. Then it sticks to the borescope mirror and it's obvious what it is. Good luck

I just cleaned it one more time and then cleaned it with acetone and it took care of the spots that were there. Thanks a bunch Rod

 

[johnthemc]

Sometimes that is the cleaner left in there reflecting and looking like slime. I'd spray with brake cleaner and dry patch out well. I borescope all mine and they look that way when I haven't got them dry enough. Then it sticks to the borescope mirror and it's obvious what it is. Good luck

Will brake cleaner do anything to the Blueing?

 

[Mram10us]

Will brake cleaner do anything to the Blueing?

I only have messed with 10 or so cm barrels, so I don't have a good answer. 99% sure it doesn't, because I cleaned them in acetone, but I'll defer to more knowledgeable guys.

OP, really glad you got it fixed.

 

[DSheetz]

If you are talking about the CRC product brakkleen it's not so user friendly and has tri-clore in it so over time it's not so steel friendly either .

 

[wonderman4]

Trichloroethane was outlawed years ago, so no, Brakekleen does not have trichlor.

 

[DSheetz]

You are correct wonderman4 it's tetrachlorethylene 127-18-4 that CRC Brakleen has in it . It needs to be used with caution at any rate with good ventilation and not around heat or open flames . If it is used around welding process's it creates phosgene and hydrogen chloride as well as being heated it does the same . Phosgene is a nerve agent and hydrogen chloride when it enters metals at the right temperatures creates hydrogen embrittlement around the grain boundaries in the micro structure of the metal