FWIW
Had some time this morning and made some calls, this was general information questions and I did not ask any question more than once since I wasn't about to be "that guy" over the phone....
Anderson Arms: call answered quickly, person very nice, he told me ALL Anderson barrels are made by a 3rd party and the only info he had available was the description listed on his screen which was the same as what is on line.
Bear Creek Arsenal: call answered quickly, person very nice, she could not answer my questions but put me on a short hold twice to get the answers. I was told the barrels are made completely in house. When I asked who's blanks they use she put me on hold the 2nd time and came back with the answer that they (BCA) starts with the raw rod and rifle, chamber, profile.. the whole 9 yards in house.
Wilson Combat: call answered quickly, person very nice, he told me the barrels are made in house. When I asked who's blanks they use and what exactly was done in house he could not answer. He was honest and said he didn't know at what point they (WC) began the in house barrel work and he did not know if they started with someone else's blanks or they did all the work in house.
Delta Team Tactical, which markets Davidson Barrels and XX-Treme Barrel Co.: tried to call SEVERAL times, phone # was not working, went straight to busy signal and or hung up as soon as dialed. Tried to look up Davidson Barrels and XX-Treme Barrel Co. on line, nothing, all roads straight back to DTT webpage
Palmetto State Arms: on hold for 12 minutes, person very nice, she told me that ALL PSA barrels are made by a 3rd party vendor to PSA specs for the given product line. When I asked if she could say who the 3rd party vendor was she stated it was proprietary.