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I would recommend getting a new spring guide stopper and a new piston. With the strength of a 170 spring the stopper will likely snap quite quickly and the stock piston in the VSR is made of relatively cheap plastic. Unless you're going with Deepfire sears (which have compatibility problems with just about every aftermarket piston out there) I'd recommend getting the Zero Trigger and piston set since it's only a bit more than buying a piston and sears seperately. Other upgrades I would recommend for that spring would be a new spring guide, a tightbore barrel and some good ammo. At 500fps you're going to want some ammo at least as heavy as .36g
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