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If the receiver is stamped "Magnum" AND/OR the serial number ends with an "M", you have a 3" Magnum receiver which can shoot any shells 3" or shorter.
If you have a barrel marked 2 3/4" you can shoot ONLY 2 3/4" or shorter shells.
DO NOT attempt to fire a 3" shell in a 2 3/4" barrel.
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