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Posted: 8/30/2025 8:15:46 PM EDT
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I go by Daryavush here. I’m checking in from Colorado, thank you all in advance for taking the time. This is what the inside of my 2013 Colt LE6920 factory stock barrel looks like. I tried cleaning it by running a solvent and then a brush several times but it does not come off. ANy suggestions as to what it might be and how I can clean it? Should I even bother? Thanks you all! — Daryavush   
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Originally Posted By Daryavush: I go by Daryavush here. I’m checking in from Colorado, thank you all in advance for taking the time. This is what the inside of my 2013 Colt LE6920 factory stock barrel looks like. I tried cleaning it by running a solvent and then a brush several times but it does not come off. ANy suggestions as to what it might be and how I can clean it? Should I even bother? Thanks you all! — Daryavush https://imgur.com/Rhyywny https://imgur.com/ZIWi5pN https://imgur.com/U4Gz2E9   Here are your pics. |
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Proud member of Team Ranstad.
Arfcom St Jude Mafia 3 years
Arfcom callsign: trenchfoot
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You're seeing copper deposits left behind by the copper jacket on bullets. It's not an issue until accuracy degrades. Clean copper out with a copper solvent and patches every 400 rounds or so. Or sooner if you want. Routine cleaning with Butch's Bore Shine solvent will reduce the build up. Butch's contains ammonia for removing the copper. There are probably a dozen similar products. The ammonia smell is moderate. Sweet's 7.62 solvent is a heavy gel specifically for removing copper; this is a great choice for heavy build up and occasional use. The ammonia smell is strong. |
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Joined:
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USA
Joined:
Aug 2025
Posts:
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EE: 0% (0)
USA
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Originally Posted By Daryavush: Thank you both for taking the time. I bought a copper solvent as recommended and here is the result! https://imgur.com/x8TEZCa 
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"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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That area is not the concern area for rifles. The part you want to inspect is the throat where the bullet will start in the bore. That is the area where the barrel will live and die. However excessive cleaning will have just as bad effect. Eventually the throat will look like a dried lake but will still be fine for many more 1000s of rounds. It’s just a good idea to run some solvent through it, let it sit, then patch it out. Don’t worry about getting it mirror shine. Right now your bore looks brand new barely 1k rounds but once you get into the 2000s, 3000s etc you’ll see it start to worsen to the point even the mightiest solvent won’t clean it out but it will still shoot fine. My thought is if you’re finding yourself looking at the bore scope so much that you should throw it out. I’ve been there myself and now don’t own a bore scope. The barrel is a disposable item and should be replaced if you’re a heavy shooter. Depending on what kind of shooter you are you might have to replace in as little as 4K rounds or it can last as high as 30k. My experience on the two barrels I’ve shot out in my life is around 13k and I’m one of the lightest shooter you’ll find. I shot my recent barrel out at the start of 2024. So don’t get too attached, don’t get too worried. If you shoot it that much you’ll be able to afford a new barrel or upper. |
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