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John, I would contact Combat Hunting Sir. -- https://www.combathunting.com/Maverick_88_Shotgun-Mossberg_Maverick_88_Scope_Mount.html

Red dot and other scopes mount to either a Weaver or Picatinny rail, check the top of your receiver if it has mounting holes you can mount one of these rails directly on top otherwise you will have to get a mount that attaches to either side of the receiver.

just install a saddle mount https://www.amazon.com/Trinity-MOSSBERG-MAVERICK-Saddle-single/dp/B01EVRFRHS