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2 years in my p90 and the sorbo is still going strong... scatterplot 70D without neoprene. There's probably about 50-60k rounds through the p90 now. It has a few marks in it from the piston head.. but nothing is cut.
Put neoprene onto it and you probably won't have to worry about the piston head cutting it apart at all... take some care and countersink the ports in your piston head and properly round them and remove the burrs and you'll have no issues ever.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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