Why would I clean a new barrel.

Got my new 700mm barrel and high capacity mags today. BEFORE instasllation, i cleaned the barrel!
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Cleaning with dry patches from the get-go is different from cleaning with a proper bore cleaner (e.g., Break Free CLP, Hoppe's bore cleaner, FP-10, etc.). I'm almost certain that you're going to see a lot more of the black (or gray or green) stuff using a bore cleaning solvent. I'm not saying your situation should be similar to mine, but it took me nearly 30 patches until I started seeing white or a very faint gray color on the cleaning patches because of the "stuff" Kalibrgun applied onto the bore of my Cricket.
 
"spinj"Cleaning with dry patches from the get-go is different from cleaning with a proper bore cleaner (e.g., Break Free CLP, Hoppe's bore cleaner, FP-10, etc.). I'm almost certain that you're going to see a lot more of the black (or gray or green) stuff using a bore cleaning solvent. I'm not saying your situation should be similar to mine, but it took me nearly 30 patches until I started seeing white or a very faint gray color on the cleaning patches because of the "stuff" Kalibrgun applied onto the bore of my Cricket.
My limited experience has been the same.
20 to 30 patches. Something like 15 wet, 2 dry, 10 wet, and a final 2-3 dry.