Is this normal in a new barrel?

[RED DIRT]

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.

What`s a "remer"

 

[DaveTooley]

Those are reamer marks that were not removed by either lapping or honing prior to a button rifling. It's a $80 barrel blank VS a $400 barrel blank. Not knowing the dimensions of the bore I wouldn't fire lap it.
The target tells all.

 

[MrK.]

If those marks scare you, looking down the barrel of my 1980 Marlin 30-30 would make you pass out.

 

[jxb]

New Ruger No. 1 barrels look far worse.

 

[L.Sherm]

I absolutely would not fire lap the barrel.
If you want no reamer marks buy a higher quality barrel.

 

[Coyotefurharvester]

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.

The feed rate, is it a start/stop movement(distance between marks we see) or is tooling in consistent movement? I recently purchased a BCA complete upper(223 Wyde) I saw little of those type marks, pretty much smooth, very slight burr around the gas port. I was very pleased to see how "clean" the bore appeared and it has shot very accurate so far(under 75 rounds). Is the bore being flushed continuously during the rifling process? Does the tool only cut in one direction, breech to muzzle(single pass) or back/forth passes expanding with each pass ?

 

[Highpower-FClass]

It is a factory CMMG barrel

For a factory barrel that looks pretty good.

I have a BCA .223 Wylde barrel that I bought a few years ago that looks five times worse than your CMMG. The BCA barrel shoots surprisingly well for how poor it looks inside.

 

[Cfshooter]

Some chatter

 

[Bill Rodolph]

I don't think there will be any reamer marks in the grooves of the barrel, only on top of the lands. Marks in the grooves has to come from the rifling process.

 

[L.Sherm]

If there reamer marks on top of the lands there will be in the grooves on a Button barrel, they have to be pre lapped out before the button is pulled the button will not " iron" them out.

 

[FrankG]

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?

those are bore reamer marks....when they pulled the button thru during rifling it presses the marks down into the grooves as well.

As long as it shoots and you don't have a fouling issue causing accuracy issues.... then don't look at it.

If it's fouling bad..... shooting won't smooth them out anymore. It is what it is.

 

[FrankG]

I don't think there will be any reamer marks in the grooves of the barrel, only on top of the lands. Marks in the grooves has to come from the rifling process.

Not necessarily....button rifling will just press the bore reamer marks down into the grooves. The deeper the marks from the bore reaming process the more it shows up in the grooves as well.

 

[MrK.]

Here is the Marlin 30-30 I mentioned earlier in the thread.

 

[Thud]

As a friend of mine once said "Shut up and shoot it"

 

[mauser284]

That is not chatter. That is tooling marks from button rifling process.

Do not take this the wrong way but CMMG is not known for making anything special in the barrel world. All that matters is how it shoots, cleans and lasts. I would not worry about it at all. Seldom do tooling marks matter at the end of the day in terms of accuracy. It can make a rifle tempermental with regards to how many rounds you can shoot between cleanings but again nothing is written in stone when it comes to what you see in a bore scope and it being a real issue in the real world.

 

[mauser284]

CMMG factory tour.

 

[Dave M.]

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?

Actually it doesn’t look bad at all for a mass produced barrel. Btw, very nice job cleaning it. The slight marks you are seeing will get smoothed out through the first 100+ rounds. Do you know who made the barrel? I don’t think CMMG makes barrels. Don’t sweat the marks though, looks good for a mass production barrel.
Dave

 

[Dave M.]

As a friend of mine once said "Shut up and shot it"

However, he probably said “SHOOT IT”. Lol. Just messing with you.

 

[Thud]

However, he probably said “SHOOT IT”. Lol. Just messing with you.

I fixed it. Spelling not my strong point.

 

[fatelvis]

I absolutely would not fire lap the barrel.
If you want no reamer marks buy a higher quality barrel.

Thank you for your input. Have you had a negative experience with fire lapping in the past?