I've had Burris FFII and IIIs on handguns and they are reasonably good sights. I think some people complain about their durability but I never had a problem. I like the auto brightness adjustments. I think they'd be find on a shotgun.

I just looked at a Holosun 510. It's bigger than a standard sized reflex optic sight you find on pistols, but not as a big as a EoTech. It looks like a nice size for a shotgun. I like the bigger window it offers over smaller reflex sight, but its not as tall or bulky as an EoTech. I think I may get one for my Winchjester SX4.

https://holosun.com/index/product/detail/id/124.html

Pic of it on a Rem 870

https://2rdrtx4bt29lo91s31mjhkji-wp...gun-survival-defense-optic-review-22.jpg

[Linked Image from i.imgur.com]
https://vcdl.org/