The CFE-9 is our longest internal box. It is a center feed design which allows a cartridge overall length of 4.000″. This box only works with magnum cartridges and will not play well with standard cartridge diameters. The kit consists of the box, follower, and spring. Modifications to the receiver, bolt stop, and stock will be required. CAUTION: MOST CLONE ACTIONS WILL NOT ACCEPT THIS BOX.