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PolarStar Fusion Engine SR25 Spacer Kit | A&K and ECHO1 SR25
The A&K SR-25 Spacer Kit comes with a Delrin spacer which gets pressed into the front of the Fusion Engine's cylinder to make the Version 2 engine the same length as the original extended Version 2 gearbox used in the rifle. Also included is a M5x0.8mm nut which is placed inside the rear of ...
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