"燧石发火装置" can be translated into English as "flint ignition device" or "flint fire-starting mechanism".
"Flint" refers to the hard, flinty stone used for striking sparks.
"Ignition device" or "fire-starting mechanism" conveys the purpose of generating fire through the striking of the flint.
Both translations are accurate, but "flint ignition device" is more concise and commonly used in technical contexts.