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When I got mine they were coming in at 420fps
But with ARS cylinder/piston heads now, the PGC mechbox's toughness is no longer an advantage. I've run mine at 380fps and 1100-1300rpm for 2 years now, and 350fps for 2 and half years before that, same mechbox shell as when i bought it, no cracks.
It helps that G&P makes some of the toughest stock shells out there too.
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