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I do use rubber stoppers but moisture can still get in around the rubber so the barrels need to be protected. Rubber stoppers can come out from the pressure that builds up in the barrels. I put a small pipe through the center of them and bend it upward to keep water from coming in. This works great.
Rubber stoppers are mandatory, but I believe coating the bores is also to be safe.
The Following User Says Thank You to Tom Flanigan For Your Post: