Just an update...
I removed the bucking and reinstalled a new dry guarder bucking and reassembled. The FPS was at 350 (low in the first place for a PDI 170) but dropped even more to 300. It was actually better/higher with the bucking sprayed with the silicon oil. I have a new Poly aluminum G36c hop up unit as well as a RH65 bucking on order. We'll see what happens then.
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