I took a paint pen and put a small mark on the screw and a mark on the frame. I used Purple Loc Tite after really cleaning the screw and the screw hole then threaded it in, backed it out to get the loc Tite in the threads good then torqued to 40 inch pounds. It was coming loose every 50 rounds and nearly fell out the last time. After doing this it has not mover in 700 rounds.

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USN Retired/VN VET
M&P X5