Hall of Infinite Doors

You quickly draw a weapon in which is supposed to resemble an assualt rifle, it takes hard work and determination to do this, even though it's 2 Dimensional, you draw the rounds, the magazines, the bullets, the shells, before long the dragon is awaiting the battle. You finally get it drawn, and begin with new furiosity firing with everything you've got, until your bullets finally run out.
The dragon looks non too pleased, still standing there, picking the bullets out of it's body. Which should have been destroyed by now. The dragon stares at you for a moment, before deciding it's moves, it breaths in, poised to blow fire, which you don't doubt is going to also be 2 dimensional, which is how you've got a chance against this beast.

You've only got a few seconds to draw yourself a better effective weapon, before you become roast stick. What'll you draw?