As the name suggests, the Spring Guide sits at the rear of the Gearbox and helps keep the spring straight as it compresses, to ensure smooth running of the Gearbox. Stock Spring Guides tend to be made from Polymer, so an Alloy replacement helps to keep your AEG running for longer. Some Spring Guides have bearings on the rear plate so that the Spring can rotate, which helps to reduce twisting of the Spring that could cause damage.
Airsoft Electric Parts - Spring Guide
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