Here's the backstory behind our Punisher Bullet Bottle Opener Keychain:

Frank Castle, aka The Punisher, removed all the gunpowder from an arbitrary bullet, kept the casing, attached a keychain to the tip, and removed a hunk of metal from the base for convenient bottle opening. 

Our Frank is a multi-tasking pragmatist.

It's a keychain AND a bottle opener (because you're sick of hefting around two separate, inefficient implements)!

The solid metal "bullet" measures 3" long and features a raised Punisher skull resting on the base, opposite the very handy bottle opening mechanism. 

And let's not forget the keyring attached to the bullet's tip. It's very sturdy, and very key-friendly.