John, yes sir, The PX9 Gen III comes in three different configurations: the Duty, the Duty Threaded, and the Tactical Threaded. All three come with a slide cut for RMR footprint optics. >>> https://transformuk.org/best-rmr-footprint-red-dot/ .....Have a great day!

John, yes Sir, the Tisas PX 9 Gen 3 Duty Black will accept a RMR red dot mount. I highly recommend the Ade Advanced Optics RD3-020 Raptor Red Dot ----- amazon.com/dp/B09BP5MPR4?tag=buyoutdoor.org-20&linkCode=ogi&th=1&psc=1