A keyblade I designed after a brainstorming sessions with a buddy of mine on one of his pics. This is a lot like Terra's Earthshaker or Ventus' Fresh Breeze, something created around a particular style of combat: in this case, guns and ranged combat. The crossbar doubles as a pair of gun handles for the different shooting modes, while the base of the hand guard can extend into a shoulder stock. The blade is upside down to how I normally draw it: the scope is the teeth, while the iron sight is on the blade side. Double Action has three modes (originally only two, but the name stuck):

Sword Mode: held like a normal blade, for melee combat and general magic
Shot Mode (labelled as Quickshot mode): held like a shotgun or rifle and uses the iron sight side of the blade, fires compressed magic "bullets" that can be fire machine-gun style or shotgun style, as well as enhancing ranged spells
Snipe Mode (labelled as sniper mode): uses the scope side of the blade and extends the stock, tuned for long-range magic and shotlocks, normal attack is a powerful but slowly-recharging shot

Oh, and the charm is a targeting reticule on a piece of glass from a scope.

Man, I need to come up with a character for this. He's probably like a kingdom hearts version of Star Wars' Wes Janson: funny, silly, goofy, and a really amazing shot on the battlefield.

Kingdom Hearts and the keyblade belongs to Disney and Square-Enix