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All Springer/NP/PCP Air Gun Discussion General > "Bob and Lloyds Workshop"

Umarex origin more power

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chuckkil:
I have a umarex origin 22cal. I'm trying to max out power to shoot 25g JSB's or slugs 900 +fps. I have drilled the barrel port to 11/64 but only get 880 fps. I think I need a lighter valve spring to get more air. Any help would be appreciated.

scottyathome0:
Did you drill out 11/64 from the valve all the way through to the barrel.

chuckkil:
The port between the valve and the barrel is larger than 11/64

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