This piston cup is designed to work with most stock and upgrade VSR-10 cylinders like Action Army cylinders, it has a slightly different diameter and is made of another material than the Scorpion SSG-10 variant to give optimal results in terms of power can consistency in cylinders other than SSG-10.
This cup also fits the SSG-10 Scorpion Piston.
Matching the piston cup in your cylinder is the most important thing to do! not all cylinders have the same internal diameter.
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