I've not seen a whole lot of gun specific stuff for Black Friday, but I have seen some years where a store like Sports Authority would advertise something like a 10% or 15% off sale which included guns. A few years back through some odd combination of discounts, mark downs, and other fanagling my mom managed to buy my dad a new Ruger 77 Mk 2 from there for a little under $350.
I feel kinda guilty though I "suggested" that might be a good gift for him since he'd been hunting with MY Savage .30-06 for the entire season after his rifle developed problems. Of course once I finally got my rifle back - my brother wanted to borrow it. He's had it for 2 years now. I think I might be buying him a rifle for Christmas this year too - just to get mine back. Again. :|