Doesn't matter if I buy it new or used, I strip ANY firearm that just came to me down to it's barest of bones and thoroughly clean it then lube up and reassemble. I don't care if it came from a top manufacturer or not, they ALL seem to leave a mess when they make them! I even do that with just parts! Like trigger assemblies, Bolt carrier groups, barrels, hell I even go over new stocks with a green cloth over all the inletting then blow it out with dry air. You are dead on correct in that advise MD!