I would like to add an adjustable gas block to my Rock River Operator2 AR-15 but it utilizes the front flip up sight gas block. I would have to change out the whole setup to add the normal style gas block so I was wondering if anyone has modified the flip up sight gas block to be an adjustable style one????? I know other people have modified the normal micro gas block into an adjustable style one but I don't know if anyone has modified the flip up sight gas block style. Please let me know if this can be done. I wanted to attach some pictures to give everyone an idea of what I am working with, but I don't know how to add it to this. (maybe someone can help) My idea is to drill into the top of the gas block, through the gas tube into where the hole is already for it, and then tap the hole and place a set screw so it threads from the top of the gas block and into the hole I drilled through the gas tube. Please give me your opinions if this can be done or not? I really appreciate it everyone!