Well I think it is time for an update
After some work on the lathe this is what I came up with .... just need to epoxy and make the parts permanent.
In the lathe and ready to get started. Began as a 3" chunk of aluminum.
Using cut off saw to part off the material, I actually took it back to the lathe and knocked down the back side for the end cap
Spacer for both parts of carbon fiber tube, as well as a barrel spacer. It is around 3-4" long, so plenty of meat to hold the barrel in place.
And then there is the end cap.
I still need to do some small cleaning up, but for the most part she is done. Just need to get the rifle together and get some shot through to make sure the end cap hole is large enough.