I'm torn.
On one hand, I hate that "OHMYGODWEAPONSARESCARY!!!!!" bias inherent to the negative reaction to this. Weapons are cool. If you don't like them, please don't make life boring for the rest of us.
On the other hand, the last thing you want to do is trivialize the purchase of weapons. "Hey kids, buy one copy of or Medal of Honor this September, and we'll also give you an AR-15 free or charge. Order in the next 24 hours, and we'll give you a 30 round clip!" There's like zero hint of the need to be responsible involved.