Prometheus EG Bearing Spring Guide (New Ver.2) For M4 / TM416 / TM417 Recoils
This excellent upgrade spring guide with bearing for New Ver.2 including M4 series, TM416 and TM417 series rifles it is fully capable of handling even the strongest of springs.
Made from the finest materials this spring guide will ensure the continued longevity of your gearbox.
We use these spring guids in our Upgrade Packages.
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