Under the gun-related circumstances in Japan, wheel lock and flintlock guns had already been imported during the Sengoku period, but in spite of the fact that they had a similar explosion mechanism to that of instantaneous discharge matchlock, the spring action was so strong that the barrel was unstable, and there was a time-lag between sparking and ignition, which caused a low accuracy rate.
こうした日本の銃運用の事情により、瞬発式火縄銃と同系譜のばねによる撃発機構を持つものの、ばねの力が強すぎて撃発時の振動が大きくなるため銃身がぶれたり、火花が飛んでから火薬に点火するまでのタイムラグがあるため、命中率が低くなるホイールロック式銃やフリントロック式銃も、既に戦国時代には輸入された。