Few years ago I bought one of thier 4-16 scopes to put on a 50bmg. They said it was rated for 50BMG- At least it lasted for 100 rds or so. Called Horus and they would not do anything for me. I ended up sending it off to an optic repair place and they fixed it the best they could but had to fix the focus on "infinity" and said there is no way this thing was designed for .50bmg. I put it on a .223. Horus = for me too.