I brought my new AR15 to the range yesterday and shot around 170 rounds. I cleaned the gun last night and the barrel seemed to clean very quickly. First I ran 2 patches soaked with tetra gun copper solvent and let it soak for about 30 minutes. I then ran 2 dry patches through it and the first one came out black and the other one gray. I then ran 2 patches of shooters choice bore cleaner and wire brushed it 3 times. I then ran 2 dry patches and the first one came out black and the second one gray again. Then I ran 2 patches of clp through the barrel and let it sit for about 30 minutes again. I then ran 2 dry patches through it again and they came out pretty clean. I outiled the barrel again with clp and let it sit overnight, today I ran a dry patch through it and it was clean. From everything I've read it sounds like the barrels are usually a pain to clean but this wasn't bad. I'm only used to cleaning handguns so I thought with the extra powder this would be tough to clean. The ammunition used was 120 rounds of WWB and 50 rounds of black hills remanufactured. The AR15 is a DPMS APA4 with the chrome moly barrel.