Hisara (Flash pan) (火皿)

Flash pan is a receptacle sticking out from the side of the barrel for priming powder in matchlock guns and flintlock guns.

The flash pan has a cover called 'hibuta' so that gun powder would not be touched by a source of fire by mistake. Colloquial expression for preparing to fire is 'hibuta o kiru,' which means to take off the cover of the flash pan.