Got my new 700mm barrel and high capacity mags today. BEFORE instasllation, i cleaned the barrel!
My limited experience has been the same."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.