These extended magazine boxes are built to allow longer bullet seating, and thus a longer than standard overall cartridge length. Installation requires alterations to the receiver, bolt stop and ejection port.
- This box extends the O.A.L. of the ctg. approx. .110"
- The box is normally sold with an F-7 follower
- Outside length 3.070", inside length 2.995"
- Requires gunsmithing/fitting for installation