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  • 03/01/2019 07:12 PM CT
    by Richard C - Lifetime Points: 1489
  • The O.D. of the mag tube on the Mossberg 500 20 gauge is .875 ". i just don't know if the 590 is the same, but I would imagine it is. If you need precise measurements, then yep, time to call Mossberg. Good luck.

  • 03/01/2019 06:02 PM CT
    by randy i - Lifetime Points: 14267
  • I suggest asking Mossberg at : (203) 230-5300 [Call: (203) 230-5300] | 8:00am-4:30pm Eastern

  • 03/01/2019 05:53 PM CT
    by James G - Lifetime Points: 30622
  • Bill, Mossberg does not make this readily available so I would ask Mossberg Customer Service directly at Tel: (203) 230-5300 [Call: (203) 230-5300] | 8:00am-4:30pm Eastern