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325 fps seems pretty low for an m120. I get around 360 with an m110 and I know my compression isn't perfect.
I'm not super familiar with rhop (none of my guns are), but I'd suspect a leak in your hopup. Try reassembling the hopup making sure the bucking is seated correctly, and/or try the stock bucking as a reference point.
It might also be the nozzle not meshing well the the bucking.
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