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Old 10-12-2017, 8:56 PM
870classic 870classic is offline
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Join Date: Jun 2010
Location: Costa Mesa, CA
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With an "X" it's a standard (12 ga) frame.
Barrels can be found at Corson Barrels.
http://www.corsonsbarrels.com/rem870barrels.htm

The magazine extension will be a problem. To the best of my knowledge no one ever made an aftermarket magazine extension for the 20ga, however. I would think that the standard 12ga barrel extension should work on your gun. The "Standard Receivers" should have the same magazine diameters for the 20ga and the 12ga, and "should" be interchangeable. You may want to try the 12ga magazine extension and see if it works. If not, you may have to slip line the magazine for the smaller 20ga ammunition. Sounds like a good project gun.

Best regards,
870Classic.
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