The supplier is here in the US although I'd like to keep that exclusive as I've put a lot of work in networking to find someone to do it. Right now I see no reason why I can't get them in 4140 although I'm going to try for 4340 also.
Ed, my seams are extremely faint. If one wanted the front seam laser welded that only adds about $100 to the overall $3000ish cost.
Michael, the one pitfall to my supplier is he won't do fixed choke, only a straight bore. An interchangeable choke system then becomes necessary.
