Known as the 50 Caliber Pen, flip version - definitely a one of a kind, a conversation piece once it is seen on your desk.
We have taken it out on trips in our carry on' luggage and have never had issues with TSA - just remember to take it apart prior to packing. If you forget, that is fine as well, just talk them through how to separate it when they pull you to the side - it is known as a novelty item.
Limited quantities available, custom orders can be made; however will take longer for delivery. This is not a one shoot pen, it houses replaceable Parker style ink cartridges.