I'm finally getting around to cleaning my new 590A1. I'm using Hoppes #9 and M-Pro 7 Gun Oil LPX. I just started and have already run into a couple of surprises. The first thing was how dirty the barrel was. I'd dipped two patches in the #9 and on the first run through the barrel they came out the other end totally black. I've never seen the barrel of a new firearm this dirty. Makes me wonder if someone had it out shooting before I got it, or is this more normal than I think? The second thing was the Mossberg stamp on the barrel calls it a Model 590, not 590A1. This is a heavier barrel than the one I had on my Persuader and it does have a bayonet lug so I'm sure it's right but why would it be stamped that way?