Help Me Determine What This Is - Bore Photo

[skeeljc]

I just purchased a Teslong borescope. I found this in my AR-15 .223 barrel. It is located about 2" back from the muzzle. What is it?

 

[natdscott]

How does the rifle shoot?

The answer to that will determine how I answer your question.

 

[STS]

I would guess that's an inclusion in the steel. A chunk of dirt in the pour.

 

[DickE]

How many rounds down that tube? That is missing metal. Poor barrel material, would be my guess or a mishap during manufacture. That is one clean looking bore though. factory barrel or custom?

 

[joshb]

Yup. Sometimes it looks like a bubble was cut in half.

 

[Dusty Stevens]

Im going to guess its the chrome lining since its an ar barrel

 

[skeeljc]

The rifle shoots o.k. It will do 1 MOA +/-. It is a SS White Oak 18" 3 Gun barrel 1 in 8 twist. .223 Wylde chamber. Barrel has maybe 3000 rounds through it. I am going to work on it with some JB bore paste.

 

[Tommie]

I’m thinking chrome as well.

 

[skeeljc]

It is a stainless steel barrel, no chrome.

 

[rwj]

I would guess that's an inclusion in the steel. A chunk of dirt in the pour.

Yup... a lot of tool steels are double, sometimes triple, vacuum remelt to remove impurities. I doubt that the associated cost is justifiable by the barrel application, especially if the defect doesn’t negatively impact performance.

 

[joshb]

I wouldn’t bother. JB won’t help that. I bought a new Brux one time. I scoped it after I had it chambered. It had maybe 20 or 30 cavities like that. I got very worried and almost sent it back. Instead, I shot it. It shoots pretty good for my needs so I’m happy. Send a scope down a Savage, sometime....

 

[billlarson]

Inclusions.... with metal defect or plating problems...
I,bet barrel makers are pulling their hair out,now that people can see their work..
Bill

 

[spclark]

I,bet barrel makers are pulling their hair out,now that people can see their work...

Had a couple Walther 6.5mm ‘match’ barrels a decade ago.

Then I bought a 17” Hawkeye.

Couldn’t get myself to accept they both shot as well as they did after I spied what looked to be worm-tracks in their bores.

 

[maxscm]

Im going to guess its the chrome lining since its an ar barrel

this ^^^

 

[MGYSGT]

Little bit of carbon along the lands. Maybe a hole of some kind. Sometimes the pics you see are not really what they appear.

 

[Uthink Uknow]

With 3000 rounds through it that barrel is junk. Oh. I mean toast. You’d have to JB that barrel past the holes and then it would be a .243 so as I say, that barrel is junk.

 

[L.Sherm]

this ^^^

Nope O.P posted yesterday its SS barrel

 

[T-shooter]

The rifle shoots o.k. It will do 1 MOA +/-. It is a SS White Oak 18" 3 Gun barrel 1 in 8 twist. .223 Wylde chamber. Barrel has maybe 3000 rounds through it. I am going to work on it with some JB bore paste.

View attachment 1152465

Paste won't help it. It's a pit in the metal. You can't buff that out. If it shoots well, you shouldn't worry about it.

 

[carlsbad]

Lot of speculation in this thread. Photos are hard to interpret sometimes and bore scope photos are hard to interpret often. It is hard to tell if what you are seeing is a raised area of dirt or a lowered area of metal damage. You can't tell if what you are seeing is solid or liquid.

Did you clean it, photograph it, and then confirm you can find the SAME defects haven't moved? (put a piece of tape on your bore scope so you can go back to the same location).

Next I would fire it and see if the defect is there after firing. look at it before you clean and after you clean.

Do copper patches come out with no blue? If it is a deposit, it should have some blue.

Bottom line is, seeing it tells you it is there but you'll have to identify it with other data besides the eyes.

--Jerry

 

[butchlambert]

Inclusions.... with metal defect or plating problems...
I,bet barrel makers are pulling their hair out,now that people can see their work..
Bill

Bill, I kinda disagree. Borescopes actually sell more barrels as most really don't know what they are seeing.