Warning - not completely compatible with rmr on fn 509 - Trijicon Night Sight Suppressor Set for FN Guns

The front sight is obscured by the RMR’s base on an FN 509. I got it installed and to my extreme disappointment, the bottom third of the front sight ring is obscured by the RMR. I own three FN 509’s … the first two are FN 509 Tactical MRD’s and they come with suppressor-height night sights that are great. Same on my FNX .45 Tactical. Co-witness is perfect. The RMR’s bottom does peek out above the bottom of the front-sight’s notch, but it is just a sliver and doesn’t interfere with the front sight. The third 509 did not come with night sights - just blacked-out suppressor-height sights. Hence the need to replace them with these Trijicon night sights. But.

I contacted Trijicon and Steve in Tech Support told me he never heard this before - while I was going to get my calipers out, he asked others he worked with and none of them had ever heard this. I got my digital calipers out and started taking comparative measurements and the sights were exactly what Trijicon expected. I sent photos of the sight picture where the RMR obstructed front sight and the response I got back from “Steve” was as follows: “Hello Rich, Thank you for your patronage of Trijicon® products and for sending the photographs requested. Unfortunately, I was able to confirm that the sight picture shown is normal for these sights on your FN509 firearm. The sights were originally designed for use with a suppressor, long before optic-ready firearms became prevalent. Unfortunately, we do not have alternate height sights available for it that are taller. We apologize for any inconvenience caused. Respectfully, Steve, Trijicon® Technical Support“

No complaints; he provided prompt support and was extremely professional. Tomorrow, I’m calling Customer Service to see if they’ll acknowledge this is a problem and will consider modifying their design. I’m hoping they’ll replace what I have. We’ll see how that goes. The right answer might be contacting FN to obtain their factory-standard night sights.