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Bore-up kits are generally designed to be used with M130 or higher springs. So unless you are building a >400 fps semi-only DMR kit with a PSG1 inner barrel (or alternately, a 50 rps bb hose with a short-stroked piston, m190 and Cyclone Dual Sector gear) you'll never need one.
Ever.
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Originally Posted by TokyoSeven
That was a very bad move on your behalf. Sort of like cutting off your foot for money, but not getting the money first and then letting the person with the money run away.
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Quote:
Originally Posted by MadMorbius
Liberals rely on emotion. Conservatives rely on evidence, and the Socialists rely on everyone else.
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