Use a cone breach that way you can index the barrel and head space it pretty easy check out guns of the week and look at the BR-50 and read it also goes into tuners also.hogpatrol said:If you could drill and tap the face of the receiver, say three or more holes, and turn a larger diameter on the shank of the barrel, and make up a ring clamp to hold the barrel flange, you could index it an infinite number of ways. Not sure how the extractor/ejector system would work.