So I bought this Classic Army RIS for my Classic Army M15A4. After numerous tries to fit the RIS onto the rifle, it doesn't seem as though the delta ring has enough room to fit that side of the RIS. I'm not sure if this is a common occurrence, but it did come with another delta ring. The only two options I can see are to either: 1. File the part of the RIS that goes into the delta ring down until it fits. Or; 2. Install the delta ring that came with the rails. Both of these are probably going to be tedious and painful, but I'd like to get some of your opinions as to what the best course of action would be to take in this instance. So, any ideas as to how I can make this work, or as to what I am doing wrong?
Thanks!