Great sight, always on - Meprolight M21 1x30mm Reflex Red Dot Sight and Fubs Self-Illuminated Flip Backup Sight

The site is awesome and works very well. Literally zeroed in out of the box on my AR platform. I ordered the 4.3 bull’s-eye and love it. Grouping’s are very tight at 50 to 100 yards. Only drawback is if you’re shooting from a dark covered area out into bright sunlight, the recital is pretty washed out, so I ordered the lens and flash guard for this. And although that worked very well minus the flash guard even with the lens tuned all the way out it’s still shaded the site window so I started looking for other options and found the mem 21 light emitting attachment, and this is awesome, even shooting out from a dark place to a bright sunlight, one twist to the dial, I get full recital, it does not matter how bright and sunny it is nice and bright, it’s only a $30 part takes a CR 2032 battery and makes this site bulletproof.