The BT rip-clip drive cone looks to be about an inch smaller in diameter than the halo B, the top hole takes an A5 hopper which is just under 2 3/8".
here are some pics :

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Things on my WTB list are:
Autococker threaded Nelson body
Assault Line "L" stock for Nelson or sheridan P series.
Send me a PM if you have any of these to sell.
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