Boarmaster123,
"I looked high and low with no success for a sleeve to cover the treads that would make the barrel look more normal."
Without looking at mine in detail I don't know if this will work, but here is an idea. Buy a CR and have a machinist shorten it and turn down the diameter. Alternatively, a good machinist can make something. Considering the cost of a CR (I don't know the current cost), I don't know which would be cheaper.
