I also have the Systema Turbo Set. I put a Systema M120 and the 300mm inner barrel and it shoots at around 370-380 with .2's. But i just slapped in the Modify sp120 (which is suppose to be shooting at 410-420). Im getting a lower reading at 360-370 with .2's. Oh btw the cyclinder port hole is almost in the middle.
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