I'm tempted to pick one of these up, they're an awesome deal in my book. Quick question though; on the bottom of the grip, there's a little nub that sits right behind the magazine. It's not part of the grip itself; it's exactly where the grip removal pin is on an M&P. Can anyone tell me what it is?
It's this doohickey right here:
It's this doohickey right here:

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