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Tentatively yes, as the 407k uses a slightly modified RMSc footprint. However, it's a known issue that included locator pins and screws are slightly too long for the 407k to fit properly. Common enough of an issue that multiple sellers offer kits to fix the problem inexpensively, one example: https://tacrig.com/product/ruger-rxm-to-holosun-407k-507k-eps-eps-carry-scs-carry-mounting-kit-screws-and-pins/

Hi Charles and welcome. Yes. The Ruger RXM allows you to mount RMR, DPP (Delta Point Pro) or RMSc footprint optics. Consult with you manual for the correct pin setting for each. Below you will find optics with the RMR, RMSc, and DPP Footprint. *Note: The RMR and DPP Footprint optics will be larger and have some overhang on the slide. Full fitment details here: https://freedomgorilla.com/collections/ruger-rxm-red-green-dot-sights#:~:text=The%20Ruger%20RXM%20allows%20you,some%20overhang%20on%20the%20slide. ---- Cheers and stay safe!

To successfully mount the Holosun HE407K-GD-X2, you will need a specific mounting solution: Adapter Plate: You can use an adapter plate designed to bridge the gap between the Ruger RXM's cut and the Holosun K-series optic. Modified Pins/Screws: Several aftermarket companies, such as TACRIG, offer mounting kits (specific screws and reduced-height pins) that allow for a proper, direct mount without an adapter plate.

Good evening to you!! The Ruger RMX takes RMR, Delta Point Pro (DPP) or RMSc footprint optics. You will need an adapter plate to mount the Holosun 407 footprint optic. You can find Holosun adapter plates with a simple web search. Hope this helps. Have a good rest of your day. 🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

Try here: https://freedomgorilla.com/collections/ruger-rxm-red-green-dot-sights#:~:text=The%20Ruger%20RXM%20allows%20you,some%20overhang%20on%20the%20slide