SHS Steel Spring Guide for Tokyo Marui M4 Next Generation AEG

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