In my first outing on my FNX45T the bottom of the tenebraex popped off. Went home and glued it back on and no issues since. The scoapcoat I ordered for my RMR fit much better with the tenebraex on than just the RMR by itself. I have the another kill flash for my ACOG and works great. Some people have an issue with brass coming back and striking the glass lens of the RMR. While no reports of this causing damage (RMR is tough) I bought this as an added protective measure. Little spendy for a plastic cover but you can decide for yourself. Also the tenebraex made it easier to initially zero my RMR to cowhitness the irons because of the ability to line up the holes and may or may not provide a more accurate front sight centered aperture for the user. Obviously the RMR is designed for quick acquisition and not accuracy. Again that is speculation and user perception. Is it a necessary accessory? No....
Would recommend: Yes
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