As a open sight, Mk2 is the best sight for the air rifle and the small bore rifle I ever had.
I ordered this sight to put on a lever action 44 mag it had me grouping a nice tight group at about 25 yards. I need to adjust it yet but it did shoot low and a bit to the right right out of the box. All 5 shots were within a one inch group.
With my eyesight I had trouble even with red dot at distance greater than 7 yds. With SeeAll I'm on target all the time now.
I bought one of these just to try out on my Henry Big Boy 45 LC
Well I been getting the verity of the sight for all my rifles and replaced my scopes with these sights ( I'm still keeping my scopes) these are well made and takes a licking and keeps on target on every time make one hole dead center!!!
Order was packaged well and on time. Going to have to practice with the sight, but I think it will be a good deal.