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Hui Dan and welcome. You would need a plate. You would not for the Holosun MOS SCS here: https://www.budsgunshop.com/product_info.php/products_id/145713/holosun+scs-m-gr+scs+black+2+32+moa+illuminated+green+circle+w+dot+reticle+fits+glock+mos --- Cheers, stay safe and enjoy!

Hi Dan, you would need adapter plate #2 to mount this. The Holosun MOS SCS would be a direct mount https://www.budsgunshop.com/product_info.php/products_id/145713/holosun+scs-m-gr+scs+black+2+32+moa+illuminated+green+circle+w+dot+reticle+fits+glock+mos , Stay safe & have a great day!