Just got my stg556 and tried to sight it in this weekend. Had problems adjusting it vertically and it’s at the limit horizontally. the optic is also way too low for a proper sight picture. On the cosmetic front, the markings are double stamped.
Anyone have contact with MSAR Dave? I left a message on his vm at the office already.
If you have a STG and the optic is to low, really the best thing for you to do is to purchase a top rail and use a scope with rings that suit you. We no longer produce either of our factory optics.