Hephaestus Airsoft announce the release of their AKS-74U/AKMSU Railed Gas Tube for AEGs/GBBs... "CNC machined aluminum construction, it is hard-coat anodized in black colour. The low-profile design allows co-witness with most micro dot sights. It is lightweight and is designed as a drop-in replacement for Gas Tube on AKS-74U and AKMSU series."
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