I don't know if you got any other responses and I don't have an answer for you. I did disassemble a 15Y this past weekend and thought everything looked good when I got done cleaning, but when I put it back together the trigger won't quite drop into the full cock notch, resulting in a hammer follow down. As I said everything appears to be lined up correctly, but I'm stumped. I can't find any good diagrams of the bolt so I'm going by pictures I took during disassembly. Good luck.