Likely a two pronged leaf spring inside the action.I wonder what kind of mainspring it has. It needs a trigger guard and a different grip. Just getting rid of that pointed bottom and square it off would help.
AgreedView attachment 365456
I had never seen an underhammer gun I didn't like, until I saw these. To my eyes that is one ugly grip.
I would use the barrel and lock in a different piece of wood!
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