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Good evening to you!! The Glock 43X Blackout #2 Will Only Accept RMSc and RMSc Footprint Optics, Must Use Included Screws From Shark Coast Tactical To Mount Optic UX4350204 Hope this helps, have a good rest of your day.

Hi Anselmo and welcome. Yes, the HOLOSUN HE509T X2 uses the RMR Footprint and you would need the Glock Optics Plate: -- https://athenaprecision.com/products/glock-to-rmr-steel-red-dot-adapter-plate?srsltid=AfmBOoqZwQP1uBa72blr9U1fv49KNz9fAhGFi6I8s2_NL-aEB1tUNjhF -------- Cheers, stay safe and enjoy!