I have a model 16 270WSM that I bought used from GunBroker.com. It shoots well, and I've already taken an antelope with it. Shooting it prone, using my backpack as a rest, I'm getting roughly MOA at 100yds. I noticed however that a few of the "teeth" on the barrel nut look slightly stripped, as if someone took the barrel off. Its very slight, and not all that noticeable, but it is something I noticed. Its a completely stock gun, and as such, it seems to shoot well, but I'm wondering if it will cause problems as I want to begin upgrading the stock, optics, etc. Is it normal to see these kind of blemishes on a stock gun? or does this mean that the previous owner had the barrel off? What would be some reasons or other things to check if it was likely the last owner who did it?