Looking at their webpage, I wonder if they make them in house?
http://masterpiecearms.com/precision-rifle-barrels/Contact Us
Mailing address:
Masterpiece Arms
P.O. Box 67
Comer, GA 30629
Physical address for shipments:
Masterpiece Arms
4904 Hwy 98 East
Comer, GA 30629
Main office: 706-783-0095
Office fax: 706-783-5800
Customer Service: phil@masterpiecearms.com
Technical/Repairs: bn@masterpiecearms.com
For Technical questions, repair and/or warranty, please send an email with the model, serial # and description of your issue or technical question. Also include your name, and contact phone # for days or evenings. Most inquiries are answered within 24 hours. Your technical needs are very important to us, so please contact us if needed.