barrelxchange, thanks for posting, I am interested in finding out more about the 7.62x39 set up, what links does this set up use ? and how well does it work as compared to 308 ? Thanks in advance. Jim.Here's an update.
I still make them and have new barrels in .311 bore available.
The 54R conversions are $450 (with parts trade in)for adjustable headspace and
$650 (with parts trade in ) for fixed headspace (similar to a vickers). Add what you value the parts and wear n tear.
The cheap(er) to shoot conversion is the 7.62x39 conversion for the 1919A4.
I am ramping up to produce about 30-40 conversions in 7.62x39. I'll post elseware with details.