For a relaxing day in airsoft, here's an ASMR episode from the guys of 4UAD Smart Airsoft. This episode show them the earliest GBB rifle from GHK Airsoft, the G5 Gas Blowback Rifle, in which they fit it in the SRU Bullpup Kit. Is it something you dig for a gas blowback bullpup with a futuristic look? Watch the video.