Tony S
[Post-stockings. Way post-Christmas, really. Left in the public foyer of Stark Tower, with a personalized (read: bar-coded) tag that eventually denotes Rocket as the sender.
It's a human-sized, custom laser pistol fitted with controls that are designed to accommodate Tony's clumsy grip. There's even a temperature gauge capable of assessing the user's mood and assigning appropriate firepower in accordance with their particular desire for violence and/or vengeance. Shield-penetrative capabilities are subtle, but present.