Magpul grip screws work fine. - FAB Defense Ergonomic Folding Pistol Grip for M16/M4/AR15

I used the same screw that came with my Magpul grip. The only thing that didn't fit was the washer but a washer appears to be embedded in the grip itself. I took the screw and placed it in the folded open grip, then through the screw hole. I then folded the grip to close it. Then I used a long hex key to help hold the screw in place.From then on it was a normal operation.