It may well have been a flintlock as noted by the drum and nipple means of ignition. That was a common means of conversion from flintlock to percussion lock. Had it originally been a percussion they would probably have used a patent breech in which the fire from the cap would go directly into the shotgun chamber as opposed to making a right angle turn as in the drum and nipple. Patent breech ignition is a fair amount faster and often more reliable
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