I bought mine 12-15-2016, the box is dated 8-3-16. The screw popped with medium pressure using the provided allen wrench. Cleaned and reassembled, went shooting, at 30 rounds, the screw was loose. Based on Barrie's recommendation and my own experience with aluminum grips on Sigs, I put an o ring on the screw and went shooting. After 110 rounds, no movement. I marked the screw and frame with a dot of paint. The screw is tight, but not leaned on with an extension. Seems to be a simple and quick fix to me. It is a nice shooter, the trigger is way better than a .22/45 I have.

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Made it, Ma! Top of the world!