Well here is an update. Got the 4506 in hand and it is in nice shape. Some holster wear on the top edges of the slide and to the stepped side of the frame. Pictures when I get my camera back from my daughter. I got 5 factory mags with it. One is clearly a 645 mag which I like a lot, 2 are red followed types with steel base pads that look as if there were rubber padded at one time. These have the mag lock cutout on both sides. The last two are yellow followers with plastic base plates. Ordered a straight stock from midway yesterday. Was the mystery of the double lock cuts ever solved? What can I use to minimize some of the scratches the she has accumulated over time?