Today was a reminder on why I recommend cleaning a new barrel.
I just got done assembling and oiling up a new AR. I was going down my checklist and remembered that I had not punched the bore yet. Since this is not a precision rifle, I don’t worry with the Dewey rods and bore guides. I grabbed a Boresnake and pulled it through. The amount of crud that came out of the other end was amazing. I gave the snake a couple more passes before I was satisfied that any debris was gone. I can’t say for sure exactly what it was that came out of the barrel, but I am positive it was not something I wanted drug through by a bullet going 3000+ fps.
No matter what the origin of a rifle, clean the barrel before your first firing. Machining debris, packing material and other amazing items all have a way of slipping into the barrel. You don’t want to destroy your new rifle because a piece of silica gel wedged itself in the bore during shipping.