I've filled in plastic forends with epoxy, but set pieces of blue styrofoam in the bottoms of the chambers to take up space without adding weight and using so much fairly expensive epoxy.
The barrel can be wrapped with tape to maintain clearance from epoxy, but don't forget release compound on the tape. I use soft paste wax, like clear shoe polish on my bedding jobs. It's the best release compound I've ever used.
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