Don't worry, it still writes underwater and upside down. It's just that this particular Fisher Space Pen is also deadly from 500 yards.
The Fisher Bullet Pen takes all the goodness of the classic Space Pen and houses it in an authentic H&H .375 caliber magnum shell. I can't say much for the comfort of the grip, but it's a great way to build confidence when tackling the Sunday Times crossword. You can get your own for $25 here. [Vat19]