Steve,
A cut in the frame would be indicative of a mag safety, not a sear safety. The mag safety idea was a bad one and many police units apparently ignored that part of the order and installed only sear safeties. The hole in the receiver that I indicated would show that a sear safety had been installed would be a vertical hole in the flange that sticks out of the left side of the receiver just above the sear bar. It would be just above the "85" in the first photo above.
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