I have talked to their shop in person, from what I gather everything (castings aside) is done in-house, apparently the trigger assembly is a Gieselle, and they expected to have BCG's for matched barrel/bolt sets available to be sold as parts by June or July. I'm thinking of buying a barrel/bolt/BCG set this summer when they become available. It was hinted at that their specs for BCGs and barrels were not proprietary, which lead me to believe that LBC barrel/bolt sets are based of the common DPMS design. Please remember that this info is based off my conversation with the shop back at the beginning of the year, some info may not be accurate, design specs could have changed in the interim, etc etc, remember that YMMV. If in doubt, feel free to call them up, they're very friendly folk and will be happy to answer your questions.