They are available almost anywhere black powder supplies are sold.

G.I. Joes or any gun shop that carries muzzleloaders has them. A big place like Sportco would have multiple models to choose from.

Any of the big catalog places would have them (Cabela's, Bass Pro SHops, Gander Mountain, etc.)

You must have oe to shoot Muzzleloaders accurately (my opinion).
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Thanks,

Fisherdan