I am sure Dlask has well documented that they make these barrels and the barrels are well marked from Dlask on the barrel. I don't plan an carrying documentation with me to the range for it. If I were going into the bush with it, any NR modern sporting firearm or an antique handgun, I would be more inclined to carry documents explaining the firearm's legality in the form of receipts, copies of the FA, or FRT's.
Cheers
Moe