Thanks for all of the replies.
The rifle shoots OK, but nothing fantastic. At 50 yards, M2 ball shoots 3-4" or so. M72 Match is much better at 2-2.5" An experimental handload shot about 2.5" with 150 gr Sierra SP.
I will try the hot wash with soapy water and see what comes out, brush it with Hoppes and follow up with JB.
Good read on the chrome-lined M14 barrels. It reminded me of the days shooting a DCM loaner NM M14.