the shaving of the lead is the bolt as it slides over the round below the round its stripping off.
that is typically a magazine issue - improper seating or seated too high in my experience.
or
if could be the lead as its going into the barrel is catching.
again since there are no feed ramps on a 10/22 its a bolt and magazine issue.
at the end of the day looking for a burr in the chamber should be pretty easily done.
ive always found the DLASK receivers to be super clean and smooth on the inside compared to the stock Rugers and all the over spray from the paint that they have.
if/when he inspects the chamber for burrs, if he finds nothing have him work the bolt back and forth a couple times with a full mag and watch on the inside to see if the bolt is running on the next round, should be pretty easy to see if it is, or if the round is hitting the side of the barrel when going in, both should be easy to see.
if that is the case then different mag or a adjustable mag will fix the issue. (adjustable like the Tactical Innovations ones)
hope that helps.
i had that same issue with a stock ruger and finding a mag that it liked fixed the issue.
Thanks way up north! Will do! Appreciate all the helpful advice!