KWA had the prototype Tavor 21 Gas Blowback Bullpup on display during the IWA Outdoor Classics 2018 in Germany. Now, Mach Sakai gets his hands on the KSC Tavor 21 GBB Prototype which is the same as the KWA though this meets Japanese regulations. According to him it has an overall length of 696mm, weight of 3690g, and the magazine is 38 rounds and is compatible to the KWA/KSC M4 gas magazines.