They have changed suppliers over the years and have gone out of business once or twice that I know of. I picked up a 30cal barrel back in 1997 think the barrel were made by K&P. You might want to post on www.benchrest.com
about those barrels, when they first came out those guys shot alot of them and PS did some articles on those barrels. Only thing I can tell you as to cleaning most good barrels clean up pretty easy as to the improved ballistic I never seen any. I took the Black Star barrel and chamber it in a 30-338mag wanted it as a back up rifle to my other 30-338mag. Both rifles shoot groups 1/2" for 3 shoots opened up abit on 5 shots. Most of my rifles that have been rebarrel I use Chanyln,Lilja,Hart,Shilen and Broughton and I can honestly say the Black Star isn't any better than those barrels.