Is this normal in a new barrel?

[fatelvis]

I just bought a new Cmmg 20” 6ARC upper for my AR lower. I cleaned it well, and sent my Teslong down the bore. I noticed a lot of chatter marks, and was wondering if this is common, or should I be concerned? Would you be OK with this in a new barrel?

 

[misser]

looks good , in time it will get better. don't sweat the small things

 

[Kracken McGraw]

I would be ok with it. It wouldn’t take many rounds to smooth it up a bit.

 

[Kracken McGraw]

10x better looking than most Savage barrels.

 

[riverwolf1]

The bigger question is, How Does it Shoot? If it shoots great don’t worry about anything else other than keeping it clean.

 

[C.E.Smith043]

Looks great

 

[powderbrake]

Wouldn't worry about it.
Nice focus on the borescope.

 

[wedgy]

I recently bought a new Ruger American and took my borescope to the shop so I could check the barrel. Looked pretty smooth but I was surprised by how much fouling each barrel had(looked at 5 total) and 2 had quite a bit of rust. The 2 Savages(Axis and a 110) did not have the typical Savage chatter marks similar to your so they must have changed something in their barrel process.

 

[RED DIRT]

I just bought a new Cmmg 20” 6ARC upper for my AR lower. I cleaned it well, and sent my Teslong down the bore. I noticed a lot of chatter marks, and was wondering if this is common, or should I be concerned? Would you be OK with this in a new barrel?

CMMG is usually really good stuff. Good job cleaning it SirFatElvis! Its tooling chatter marks.
It looks fantastic for a normal production made barrel. Shoot da hell out of it! You`ll be fine!

Bore scopes been freaking people out for a very long time. And more now since they`re more affordable.

 

[6.5 forever]

I definitely would not accept that from a custom barrel.....

 

[RED DIRT]

Indefinitely would not accept that for one for a custom barrel.....

I don`t think his is a custom barrel though. At least i didn`t see that mentioned in his post anyway.

 

[jackieschmidt]

I certainly would not accept a Krieger or Bartlien or Brux that looked like that.

But then Krieger, Bartlien or Brux would never let something like that get out the door.

 

[DLT]

Looks damn good compared to my savage barrels. That’s where the button was pulled through correct ?

 

[anschuter2013]

For a mass produced barrel, it looks above average and will probably shoot fine for a while. The tooling/manufacturing marks that most folks seem to think is fine from an accuracy stand point is true, but my opinion and experience is that it will not "smooth out" over time and round count. Those tooling marks are an ideal place for heat checking to start and continue to get worse. That will lead to a barrel that fouls quickly and is difficult and time consuming to get clean.

But, it's on an AR gas gun, go shoot it, have fun and be happy. You could return it and swap it for another, but the replacement will be the same or worse.

Just my opinion.

 

[Straightshooter1]

I just bought a new Cmmg 20” 6ARC upper for my AR lower. I cleaned it well, and sent my Teslong down the bore. I noticed a lot of chatter marks, and was wondering if this is common, or should I be concerned? Would you be OK with this in a new barrel?

Looks ok to me. The bore just hasn't been lapped, that's all. The higher end barrels like one would get from Krieger, Bartlien or Brux would be lapped where they'd be smooth and not look like that.

 

[fatelvis]

I don`t think his is a custom barrel though. At least i didn`t see that mentioned in his post anyway.

It is a factory CMMG barrel

 

[fatelvis]

Looks ok to me. The bore just hasn't been lapped, that's all. The higher end barrels like one would get from Krieger, Bartlien or Brux would be lapped where they'd be smooth and not look like that.

Would you guys suggest running a Tubb Final Finish kit through it to smooth out the chatter marks?

 

[Straightshooter1]

Would you guys suggest running a Tubb Final Finish kit through it to smooth out the chatter marks?

That's what I'd do to reduce the amount of fouling that's likely to occur otherwise. I've used Tubb's Final Finish kit on factory barrels and it works nicely.

 

[Bill K]

I have seen a few quality barrels, various brands that have more light chatter marks than that one does.
They shoot just fine.

 

[tommeboy]

Would you guys suggest running a Tubb Final Finish kit through it to smooth out the chatter marks?

They are NOT CHATTER marks. What you re seeing is the feed rate of the remer being fed in the barrel to ream to final size. It is NOT from the button chattering. I wish everyone would stop spreading the wrong info.

Don't worry about it and just shoot it. These are really smooth compared to others I have seen.