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"The slide of the optic-ready MC2c is machined with the footprint of the Shield RMS, although Mossberg recommends the smaller RMSc-size sight since it's narrower and matches the gun's width. Installation of the reflex sight requires removal of the top plate with the provided 2mm Allen wrench."

Hi Christopher and welcome. This model has a Shield RMS/RMSc footprint. Several Red/Green Dot Optics choices here: https://www.budsgunshop.com/search.php/type/gun+sights+%26+optics/q/rmsc --------- Cheers, stay safe and enjoy!

Hi Christopher, this has the RMS footprint, it will accept both RMS & RMSc optics. budsgunshop.com/product_info.php/products_id/730007892/sentinel+ii+1x20+micro+red+dot+3+moa+-+blackout+rear , Stay safe & have a great day!