Removing carbon from back of bolt, and inside bolt carrier, in AR

Dental picks, steel wool, emory cloth. If you lube the BGG with white lithium grease, it will clean up easier after you shoot. Also, you don't need to get every speck of carbon off to keep the gun reliable. Functioning gas rings are more important.

Soak in CLP.

If you really want to make cleaning easy buy an ultrasonic cleaner off Amazon

for the tail of the bolt, a brass case of about .30 caliber makes a decent scraper. For the inside of the bolt carrier, a piece of brass bar from the hobby metal rack, 1/2 inch wide I think, used as a scraper. And of course, Brownell's makes a tool for that.

One of these. Works great at cleaning the inside of the bolt carrier.

https://www.midwayusa.com/product/1018808678?pid=398324

Balrog said:

I have some really stubborn carbon on the back on an AR bolt, and correspondingly inside the back of the bolt carrier group where the rear surface of the bolt makes contact with the carrier.

I have scrubbed with bronze brush and patches, can get some off, but not all.

What is the best tool to remove carbon from these 2 locations?

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A good soak in gasoline, solvent, or a longer soak in CLP. Swish it around in there occasionally. Next time clean it more often so it doesn't get that way.

I found a lubricant that helped keep carbon from sticking in the first place. ATF.
It's a detergent, it carries away carbon.

I don't think I have ever done more than wipe that off with a Break-Free CLP soaked rage. With sufficient lubrication the tail of the bolt sort of self cleans itself scrapping excess build up off with each cycle. Never found it to cause any real issues but I am not much of a gun cleaner in generals...

I haven't found the need to worry about carbon build up in my AR's when cleaned and lubed regularly. Usually a light coat of your favorite gun lube on all parts helps make cleaning carbon off pretty easy.

Now if you want to talk about carbon build up. Look at military rifles after long field exercises with prolonged use of blanks. Now that is when you have to really worry about carbon build up.

I soak mine in Slip2000 Carbon Killer. Finish with a scrunge.

entropy said:

A good soak in gasoline, solvent, or a longer soak in CLP. Swish it around in there occasionally. Next time clean it more often so it doesn't get that way.

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Wait, what? Cleaning after use helps keep it clean? That’s not very tacticool…

I bought one of these and it easily scraped off any carbon.

https://www.amazon.com/gp/product/B07JX6BRMB/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&th=1

try soaking it in mineral spirits