I have a few factory sealed Holosun HS507C-V2's available.

Depending on the quantity, price is negotiable.

Info: V2 has the upgraded battery tray with (vertical) button placement matching TRIJICON's sights. These are superior in my opinion and are amazing sights.

https://www.deltateamtactical.com/holosun-technologies-hs507c-v2-red-dot-sight.html

https://dukessportshop.com/product/holosun-red-sight-hs507c-v2/

https://www.opticsplanet.com/reviews/reviews-holosun-hs507c-v2-red-dot-sight.html

https://holosun.com/uploads/20200331/29cd719de9508ad751f27af4859c1957.pdf