SHS Steel Spring Guide For TM M4 Next gen

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SHS Steel Spring Guide for Marui M4 Next Generation AEG
Stainless Steel Construction
This Bearing Spring Guide replace the original Spring Guide of Airsoft AEG
To build a tight & durable gearbox
This spring guide with Ball Bearing is designed to minimize the load for the motor caused by the spring tension
Backstop is specially equipped with EIGHT Ball Bearing to prevent Spring Tension build-up during Full Auto Shooting Mode. It greatly reduces the risk of spring breakage
It also makes spring effectively spring back

Especially important for upgraded AEG to install this
Suitable for Marui M4 Next Generation AEG Airsoft Gearbox
Recommended to use inline with Upgrade Spring