This video from RogueSystem087 was posted last December and shows the various railed gas tubes for the GHK AK Gas Blowback Rifles. Made by Hephaestus Airsoft, the company usually cooperates with GHK for upgrades or unique airsoft projects. There are three versions made for the AMD65, AKS74U and AKM/AK105/AKS74 GBBs.
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