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A 170 is far over legal limits int he uk. The spring guide is stock, if the piston is red its upgraded, the cylinder head is upgraded, the cylinder is stock, the black sear is upgraded and the others are stock.
Although it is above legal limits in your country i will explain anyways.
Zero trigger and piston set
the spring
cylinder head and teflon cylinder
spring guide
might want the upgraded bolt handle because its easier to pull.
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