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  1. A

    4 Bore Breech Plug Threads?

    Hey all. I am in the process of making a 4 Bore blunderbuss barrel and I am not sure what to thread the breech too. The bore is 1", and I plan to make the threads 1 1/8-16 to minimize the risk of corrosion getting into the threads. I am going to make my own plug, and I am turning the threads...
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