It works fine. You need the long nozzle, a spacer that goes over the long nozzle and bridges the gap between the mechbox and hopup unit (standard M4 hopup), and a spacer that screws into the spring guide (it screws onto the back of the mechbox...the stock screw then screws into the spacer) and bridges the gap between the mechbox and rear receiver.
Everything else is "normal".
Hope that helps,
Tys
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