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Hi Bradford and welcome. The Rock Island M5 shotgun is considered a Mossberg clone, specifically mimicking the Mossberg 500's action. The OpSol Mini-Shell Adapter would be needed:-- https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish

Good morning to you!! The RIA tactical 12 gauge will need a mini shells adapter since it is a clone of the Mossberg 500. Please see the link below for the mini shells adapter you will need. Have a good day. budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish

You need a mini shell adaptor: here—> https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish