It still shoots pretty awesome around 310ish bar.Gotcha, I've read several guys here being able to pump their gk1 to 5000 psi with a 4500 pump so I got me a 4 stage pump.
On a different note It will dump all the air sometimes after emptying the magazine. It especially does it when it’s cold outside, or I shoot VERY rapidly and the cold air it makes while shooting it does the same.
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