This seems neat, the chamber and throat are separate from the barrel. I haven't heard anyone talk about these.
http://battacticalactions.com/10601.html
http://battacticalactions.com/10601.html
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BAT links to this pageSaw the same exact concept at this place, clearly its the same system. Seems interesting but not sure how many people would really be interested in it. If it worked out the way it's designed it would allow you to keep burning up barrels while keeping the same chamber throughout, which could be nice for people who frequently shoot out barrels and would like to keep using the same brass and everything.
http://www.wolfprecision.net/new-chamber-cylinder-system.html