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I didn't actually get my pin drilled out. I'm lucky enough to know some people with some welding skills so I got them to attach a small piece of metal to the pin and then just pull the pin out of the cylinder. Much cleaner than the drilling approach and there's no chance of killing your cylinder or cylinder head.
As far as your questions go JDM,
My setup runs right around 440FPS and all I have in there is the 130 spring and the Laylax 430mm 6.03mm tight bore barrel. There have been no reliability issues so far and I've been running it in this form since spring.
Those prices you listed are in American funds so you are looking at a fair chunk of cash if you do want to go with the quality setup as bean said. With this rifle it's pretty much an all-or-nothing upgrade. The Zero Trigger is definitely worth it since it costs about the same as upgraded sears and piston and that's exactly what it replaces. Plus you get a kit that should work flawlessly unlike the separate sear/piston combos out there where you could have tonnes of fitment issues. The only real negative is that you lose the safety.
I can't comment on accuracy at that FPS and the stock barrel since I replaced both at the same time. With the 130 spring and the tight bore I know I've had confirmed kills out to 250 feet but that is pushing the platform. I would say that 200 feet is the upper limit on the rifle pushing sub 450FPS.
If you do decide to go the Teflon cylinder and Zero trigger route you'll also need the spring guide and piston head.
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