Just before I went on the vary, I tossed an HS509T about the AR 410 and did a quick zero with buckshot loads. I love these tiny optics on shotguns and make use of the circle and dot reticle. The circle is for buckshot, plus the dot is for slugs. https://charles-daly-410-ar-upper75184.bloggerchest.com/18386521/not-known-details-about-charles-daly-m4-shotgun-review