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How can I tell if my Model 870 shotgun has a magnum receiver?

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Overview

If your Model 870 serial number ends with "M" you have a 12-gauge Magnum receiver that is capable of shooting 2 3/4-inch and 3-inch shells as long as your barrel is chambered for 3" shells.

If your serial number ends with "A", you have a 12-gauge Super Magnum receiver that is capable of shooting 2 3/4-inch, 3-inch and 3 1/2-inch shells with a barrel that is chambered for 3 1/2" shells.

If your serial number ends in "N" or "U", you have a 20-gauge Magnum receiver that is capable of shooting 3-inch shells with the correct barrel.

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