The Fibur-X barrel system consists of three parts- The thread adapter to match your gun type, a carbon fiber "main-barrel" which is the main part of the barrel (sets the length), and a Freak insert which sets the bore of the barrel.
This is for just the Fibur-X threaded adapter by itself. Also called a "Back". Must be used with a Fibur-X Main-Barrel.
Adapter Requires both a Fibur-X main barrel and a Freak Insert for use!
This only works with an undercocking setup!