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Hi Dean and welcome. No, a Benelli M4 tube extension will not fit a Benelli M3. Cheers, stay safe and happy holidays!!

This will Not work with an M3.

sorry it is model specific and will not work

Hi Dean, no sir, you need one made specifically for the M3, which sem to be out of stock everywhere >>> omahaoutdoors.com/benelli-m3-2-shot-magazine-extension-kit/ Stay safe & Happy Holidays!