These extended magazine boxes are built to allow longer bullet seating, and thus a longer than standard overall cartridge length. A window and break-point are also incorporated for use with wider cartridge case bodies, such as those used for the various Ultra Magnums. Installation requires alterations to the receiver, bolt stop and ejection port. Incorporates a window and break-point to allow for wider cartridge case bodies such as the Winchester Short Magnums, or may be used for standard cases
Box allows for a cartridge overall length of approximately 3.850"
Outside length 3.920", inside length 3.850"
The receiver, bolt stop and ejector must be altered to use this box
Requires gunsmithing/fitting for installation