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Hudson last won the day on November 8 2016
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I got nearly 380fps out of an M90 spring. This was supposed to be a downgrade! >:[
new box/gin must have bore up cylinder, tbb and all perfect seals etc....
old box maybe worn seals, cyl volume ratio out etc.... so performed not so good
But 30 over limit or 50 increase from 1 box to other - jeez is quite a lot
you sure it was a m90 ?
That's what it says on the box!
Going to swap it all out into a quick change box so at least I won't need to disassemble it fully in future.
And no, just a standard cylinder!