I just bought the iwc qd sling mount for my collapsing stock. The screws are gonna fit fine but the mount will need filed it appears. Do y’all file the lip down on both sides? After it’s filed and fits e slot, it also is longer than the thickness of the slot, so did you shorten the length on what will stick through the slot also? Seems like a lot of work that could have been done by the manufacturer before selling it for a m4 stock. Just curious what all needs to be done exactly before I overdo