The whole barrel is NOT turning. If you look at the video you can clearly see that it has a front sight base that is spinning on the barrel. That won't affect head space in any way.
VZ 24 rifles have an interesting history and there is no one method that they were made. once the Nazi's took over the sudetenland they continuously and incrementally modified the VZ 24 design so that it evolved into something much like a K98. Either silver soldre the sight base in place or epoxy it to keep it moving.
None of my mausers spin like that, My 1939 VZ 24 front site has what looks like a dovetail/dado attachment. My M48 yugo, arisaka and all my turk mausers have a seperate front sight base similar to in the video.
Last edited by ISC; April 5, 2009 at 04:24 PM.