Flugelhorn Mouthpiece Bob Reeves 40 C2J B

This is a custom-made Bob Reeves C2J mouthpiece with a flugelhorn shank.
I ordered it because it has more volume than Bob Reeves' HF cup, with the intention of gaining volume without sacrificing range when playing flugelhorn, especially with instruments like the British brass.
Since it has a back shank, it cannot be used with a trumpet.
The rim and cup are both size 40, but there is a slight step between the rim and the cup.
It is unclear whether custom shanks are still being accepted.

I have many other items listed, so please check them out if you like.
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Type... Flugelhorn
Accessories/Parts... Mouthpiece