I only live about 10 or so miles from Douglas Barrel Co. and had them do the work on both the NO 1 and NO 3.
Have used Douglas for various barrels over the years and find them to be quite accurate and overall, well done.
Over the years Douglas has done considerable number of barrels for the military and LE groups and have what is called a SPR MK 12 Mod 0 which uses a Douglas barrel as well, it is an accurized AR 15 version of the M16 military rifle. Douglas does good work.