In order to make up for the shortcomings, a serpentine-lock system was contrived, where a match was sandwiched between serpentines and was cocked and set off with a trigger, and changes in structural aspects such as the gunstock and so on advanced and the hinawaju was completed.
この欠点を補うため、火縄をS字型金具（サーペンタイン）ではさんで操作するサーペンタインロック式が考案され、さらに銃床など構造面の整備が進み、火縄銃が完成した。