My vote goes to the Lonex chamber too, but I'll share what I had to do to modify the Prometheus:
Like you said the shaft was a little bigger than the hole on the gear that I had (that's what she said), so I had to widen the hole a bit.
The upper receiver didn't clear the chamber and I had to dremel it out so that it would fit, but that's probably due to the fact that my hop chamber originally had a different design.
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