The Nordic Components +4 MXT Extension Kit adds four rounds of 12-gauge capacity to Mossberg 500 and 590 series shotguns.
- Part Type: Magazine Extension Kit
- Compatible Firearms: Mossberg 500/590 series 12 gauge
- Capacity: +4 rounds
- Material: Aluminum
- Finish: Black
- Installation: Drop-in with basic tools (magazine tube nut required, not included)
- Includes: Extension tube, barrel clamp, spring, installation hardware
