I'm also having the mag drop problem with the extended mag in my .40 Shield. It happens about every other round on average, although sometimes it will happen for several consecutive rounds. I went to the range for the first time with this weapon on Sunday, and shot about 300 rounds through it. I field stripped it and lubed it before the range trip. It got so exasperating using the 7 round mag that I probably shot over 250 rounds through the 6 round one. I also had the range officer, a person whom I consider very knowledgeable about firearms in general, to try it to make sure I wasn't crazy. He experienced the same mag dropping problem with the 7 rounder. I had this happen with the 6 round mag perhaps 3 or 4 times out of the 250 or rounds fired through the smaller mag.