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PSS2, they are APS2 parts (also compatible with the CA M24), and make damned sure nothing PSS10 gets ordered, it's for the VSR.
Get the Laylax SP150 spring and a 9mm bearing spring guide, since anything lower than a 140 spring uses a 7mm spring guide and spring. And depending on the piston, the inner diameter might be too small to handle the 9mm spring. Measure it first to make sure, might have to buy a new piston and piston head.
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