Mach Sakai reviews the Tokyo Marui HK45 Tactical gas blowback airsoft gun, purchased from Frontier hobby shop for ¥17,000. He points out the differences from the standard HK45, including a threaded outer barrel, ambi safety, and slightly different sights. This GBB pistol is about 32cm long and weighs 850g, with a magazine capacity of 26 rounds. He tests the trigger pull, demonstrates disassembly, and adjusts the hop-up. Performance is tested at 15m, with a gas consumption of 0.16g per shot, allowing for 139 shots per gas charge. The video also includes the airsoft gun being used in a speed steel challenge.