There is no difference between the 6.01 and its wider cousins when it comes to dirt in the barrel, since we're talking about 0.0n milimetre...
According to some people over at Arnies, replacing the stock hopup sleeve with an aftermarket one yields some improvement. I'd personally also replace the piston lid with a more conventional O-ring piston head.
Finally, remember to switch to heavier BBs. Even if you don't reach that 350, switching to heavier BBs will improve accuracy.
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