They are muzzle loading muskets (long guns)- or rarely, pistols (short guns). Matchlock means that a slow match (a smoldering piece of thin cord) is pressed into the priming powder to make the gun fire. The link below is to a good photo of a typical matchlock musket.
A type of a gun.
Matchlocks and wheellocks
Teppo matchlocks, or imported flintlocks.
A Japanese matchlock rifle 28 bore. Signed barrel round with aiming flat on top, 75cm, overall length 108cm. All brass furniture. Fully stocked. Japanese type flower inleted near flash pan. I got this answer off the internet. Go to http://www.henrykrank.com/mfsr122.html
There were matchlocks before flintlocks. They used a slow burning string, something like a fuse. The "hammer" held this in a clamp and when the trigger was pulled the lit "match" touched the priming powder in the pan (with any luck) firing the gun.
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