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Your stock Systema M170 box need a few fine tuning before you can have optimum performance for example, when I was still actively using the PSG I swapped the barrel to extended PDI barrel 680mm that will put the inner barrel a cunt hair below teh barrel opening of teh PSG1 then I swap the cylinder to a bore up and swap the hopup to a Systema metal V2 enlarge the V2 nozzle abit and voila consistent 480fps with .25 with a PDI 280% spring in addition you will need a barrel spacers and also a thing they called Block spacers for G3 (I highly doubt they sell this anymore).
At the time there were three of us with these customize set up, Myself, Wil from SD-unit and Gary my ex teammate from Hotshots, we can easily outrange any modified AEG at the time
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