There may be some "if's" or "maybe's" involved here and perhaps all stores won't participate but it looks like WM is trying a new marketing scheme. Hope you guys have enough ammo for now and don't get caught up in this. I went through my share of Black Fridays when my kids were young and WM sold hard to get toys on this day only.
http://www.gunnews.com/22-go-oh-yea-went-wal-mart/
Reading the comments to the article it states that this sale may happen on 10/4 instead of the day after Thanksgiving.