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The VSR cylinder is good to something crazy like 590mm
But the time the piston arrives at the head vs the time the BB leaves the barrel is actually perfectly timed at around 400mm of barrel.
I never understood how my VSR was so damn silent when I first built it. Had no air brake, only used 1.5" of it's silencer, and it was a flat head piston hitting a hard rubber cylinder head face. Yet you could not hear it fire from 10 ft away.
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