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Help with Vent Hole Liner ID

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Joined
Feb 3, 2017
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Location
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I have the below vent hole liner in a barrel I got. It is a replacement and whoever replaced it also drilled and tapped out the hole to enlarge it. It appears they wanted a percussion/flintlock interchangeable system. Everything works fine, but I would like to have some spares on hand.

The threads are 5/16-24 for sure. I thought it was the RMC liner that uses the Allen wrench system so I ordered some of those. The head on the RMC is not as big as the head on this one. If anyone has a clue as to who makes these, I would sure appreciate a lead. Thanks in advance

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