What is your ejection pattern like? I get one shells popping up right at 12 o’clock. There is not a lot of overhang on the echelon port, FN 509 is way worse, and a bunch more prone to this from videos I’ve seen.
Thread resurrection!
I found this searching online and would offer the following feedback on the Echelon + RMR HD.
Don’t do it.
1) Trijicon tells you straight away in the manual for the RMR HD, don’t do it.
https://www.trijicon.com/uploads/page_content/PML1057-1_Rev(0)_RMR_HD_Manual.pdf ...