Brash brush isn't necessary. Proper cleaning is. Modern solvents make if fast and easy. I notice fouling in all my glocks. Many who have never seen a clean vote think gray streaks and carbon buildup are normal. I think you're describing carbon. Pics?

 

I do not know how long you have used the Ballistol,you state 600 rounds,the continued use of Ballistol usually reduces the fouling build up.
I've found it's use sort of like seasoning a cast iron pan. SJ 40

 

The brass brush is key for me. I shoot .358 moly bullets, which definitively necessitate cleaning with a Glock barrel. The barrel does not have to be cleaned every time the gun is shot, but it generally works better that way.

I use Ballistol for the first pass or 2, followed by brass brush, then patch wrapped around OE brush. Ballistol is not much of a solvent, but it picks up the loosened fouling as a damp cloth picks up dust.

When most of the fouling is out, I continue with the brass brush using just the residual oil in the barrel, and swab with patches. Usually 4 passes total, takes about 5 minutes, and the barrel is completely free of fouling when I’m done.

You can get a tiny bit of leading with moly if the bullets get shaved when they are seated, etc. But most of what’s in the barrel is a mix of carbon and the moly coating itself. I’ve gone about 2000 rounds without cleaning the bore at 2-day classes a few times. Everything works fine, but it’s all-around easier to just clean the bore each time I shoot, if I’m not in a hotel.

There’s no need to worry about using a brass brush. As long as the brush/rod/fittings are softer than the barrel, it’s fine. I’m still using my original G34 barrel, coming up on 100,000 rounds. I’ve scrubbed the crap out of it hundreds of times, and it still groups the same as it did new. It’s the only part left from my original 34.

Mechanical action is faster, cleaner, easier and less expensive than solvents. And it works 100% to get those last little smears of fouling or lead out of the bore.

 

Brash brush isn't necessary. Proper cleaning is. Many who have never seen a clean vote think gray streaks and carbon buildup are normal. I think you're describing carbon. Pics?

You're correct....It was a "carbon" build up, I miss wrote. Still I've never it noticed to be a problem in my other Glocks.

Ballistol is not much of a solvent, but it picks up the loosened fouling as a damp cloth picks up dust.

I'm starting to realize that now...Still I love the stuff. I suppose I'll start using a little more Break Free CLP for cleaning and to prevent the carbon buildup, then finish up wiping it down of the Ballistol.

Thanks everyone for your comments....

 

I haven't cleaned the barrel in my match guns in 10's of thousands of rounds. Accuracy will generally improve if you don't in pistols, so long as you are shooting jacketed bullets. Lead is another matter.

Simply brush out the chamber.

 

I use carburetor cleaner to get the carbon out. Always works for me.