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Hi Devin and welcome. No Sir, the Trijicon RMR Optic will be a direct fit, no plate needed. Cheers, stay safe and enjoy!

Per description: Optic cut fits Trijicon RMR/SRO and Holosun https://www.budsgunshop.com/product_info.php/products_id/730005908/shark+coast+tactical+greasy+custom+stripped+for+glock+19+gen+3+or+slide

No plate needed, the Trijicon RMR will be a direct fit.