Hi, everyone. I'm new here and I came here looking for answers about my gun because I haven't found any videos or directions on how to do this that came with my rifle. I got myself a new Ruger Mini 30 in 2022 and took it to the range and popped off a few shots from 2 magazines to test it out and see how it handles. The Range Officer said my shots were hitting the berm instead of the targets and said that the rear sight needed to be lowered. If anybody could answer as to how to do this and what tools I would need for it, that would be great. (It looks like an Allen Wrench for the screw, I don't know what size would work.) Thanks.-Cheyenne.