B-Square, Millet and Aimtech make saddle mounts for shotguns. They do not list the M3000 as one they make. Looking at pictures, the contours and pin spacing between the 3000 and the 870 sure look pretty similar. The trigger housing pins on the 870 are 2" center to center. From the front pin to the top of the receiver is 1.8". Whether or not an 870 mount will fit a 3000, I do not know.
Perhaps a call to any of the makers listed above can shed some light on the subject. Good luck.
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SWCA 3297 SWHF 583
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