Help Me Determine What This Is - Bore Photo

[JMayo]

Bore scopes will make a flea leg look like a log !

 

[Ned Ludd]

What we need now is binocular bore scopes that actually give 3d imaging.

This would result in multi-dimensional Borescope Anxiety Disorder, which is really BAD.

 

[skeeljc]

I cleaned the barrel again. Three wet patches with Bore Tech C4 Carbon Eliminator, 10 strokes with a nylon brush wet with C4, let it set for 15 minutes, 10 strokes with a bronze brosh, three dry patches.

There is NOTHING in the bore to look at except some possible damage on the far side of the gas port. My final conclusion is everything was carbon deposits.

 

[skeeljc]

Here is a shot of the muzzle (it is threaded).



Here are some pics of the throat.

 

[spclark]

Port erosion's pretty good for 3,000 rounds fired... the other images don't show anything worrisome either.

IMHO I'd just shoot it until you find your 600-yd groups getting larger than the X-ring

 

[GrocMax]

Keep in mind always that any small droplet of liquid left over will act like a lens and make things look really bad, when all you need to do is dry patch a couple times and recheck.

 

[David101]

Thats a nice clean throat. I have a bit of carbon build up that sits in the gap between the case neck and the throat that I cant seem to remove clean. Any ideas on how to tackle that spot?

 

[nicholst55]

Take a look online and see if you can find a downloadable .pdf copy of TM 9-1000-202-14, Evaluation of Cannon Tubes. It has some excellent photos - many in color - of defects inside cannon and mortar tubes. The Army has been using borescopes for many decades, and they have put a lot of effort into providing verified examples of various defects. You'll see examples of stripped lands, worn lands, peeling chrome, rust pits, heat checks, cracks and incipient cracks, gas erosion, etc. Having a verified example of a specific defect or type of damage might help folks diagnose what they're seeing inside their own rifle bore, and determine just how potentially serious it is.

 

[skeeljc]

Thats a nice clean throat. I have a bit of carbon build up that sits in the gap between the case neck and the throat that I cant seem to remove clean. Any ideas on how to tackle that spot?

Your bore guide should stop before the chamber shoulder so your cleaning patches/brushes should be able to clean the neck/throat areas.

 

[skeeljc]

Now that I understand what carbon looks like how do I tell what copper looks like in the bore scope?

 

[Ccrider]

Now that I understand what carbon looks like how do I tell what copper looks like in the bore scope?

Easy. It looks like copper. Streaks.

 

[INShooter]

Thats a nice clean throat. I have a bit of carbon build up that sits in the gap between the case neck and the throat that I cant seem to remove clean. Any ideas on how to tackle that spot?

Use an oversize bronze bore brush that is the size of your loaded round. Put a little solvent on it and twist it in the neck area. Don't push it into the bore.

 

[hogpatrol]

With the popularity of the Teslong, what was once a rare disease has since become an epidemic. It's known as BIPS or Borescope Induced Paranoia Syndrome. Usually accompanied by copper flakes, specs of carbon, patch lint and various drops of fluid. Only known cure is ignoring all the symptoms and performing a target test.

 

[243winxb]

how do I tell what copper looks like in the bore scope?

https://www.thehighroad.org/index.p...-bore-cleaning-with-more-teslong-pics.860996/
More Teslong photos. And Tubb Final Finish Bore Polishing System

 

[divingin]

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

Yeah, well, except where it flaked off...

 

[gunsandgunsmithing]

Yeah, well, except where it flaked off...

This was addressed in an earlier post. It's a ss bbl and not chrome plated. I mentioned that it looked like moly or similar, at first glance and that is what it looks like. The op never said(that I've seen) if he has shot any coated bullets through it but said that it mostly cleaned out and thinks it was/is carbon. I can't disagree but it looks more like moly or danzac than carbon, to me. I won't disagree, since I can't say for certain. I've just never seen carbon flake off like the pics show, but I have seen moly in the bore look just like that. Regardless, it appears that a good cleaning is getting whatever it is, out.

 

[Dusty Stevens]

This was addressed in an earlier post. It's a ss bbl and not chrome plated. I mentioned that it looked like moly or similar, at first glance and that is what it looks like. The op never said(that I've seen) if he has shot any coated bullets through it but said that it mostly cleaned out and thinks it was/is carbon. I can't disagree but it looks more like moly or danzac than carbon, to me. I won't disagree, since I can't say for certain. I've just never seen carbon flake off like the pics show, but I have seen moly in the bore look just like that. Regardless, it appears that a good cleaning is getting whatever it is, out.

And the borescope images make it look like a pit when evidently its raised since its coming out

 

[gunsandgunsmithing]

And the borescope images make it look like a pit when evidently its raised since its coming out

I can see how you would see it that way and I've seen bunches, as have you, I presume. All I can say is, I never saw his initial pictures as a hole or depression, just a buildup of something. Funny how we all see something differently at times.

 

[rwj]

Funny how we all see something differently at times.

It’s what makes life soooooo interesting!

 

[divingin]

Take a look online and see if you can find a downloadable .pdf copy of TM 9-1000-202-14, Evaluation of Cannon Tubes.

Available here, though the PDF version I downloaded appears to be monochrome only (no color images that I saw):

https://archive.org/details/TM9-1000-202-35/mode/2up