Nord MXT Extension Tube 12 Gauge +4

Nordic Components MXT magazine extension tube. - MXT extension tube for changing magazine extension length and capacity - Available in variety of lengths between +2 and +9 (shell capacity measured with 2 3/4 shells and may vary with shells of differing length) - Features relief groove to eliminate barrel clamp travel and ensure repeatable placement after disassembly - Relief groove is not centered and can be relocated by reversing the tube (thread pitch the same on both ends) - Includes ONLY MXT tube - May require purchase of new magazine spring if you are changing the capacity of your existing extension