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Ya, VSR is really rough on sears when upgraded, even aftermarket sears break with moderate springs. So Zero Trigger will be required (and the associated piston), a Laylax/First Factory PSS10 130 spring (sit around 430fps), and tightbore and bearing spring guide would add around 25fps. And make sure you cut off the airbreak (the ***** that sticks out the front of the pistonhead), otherwise your velocity will sit around 330-350fps regardless of what spring you put in.
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