Mach Sakai checks the performance of a not-so-new product, the Tokyo Marui Glock 19 GBB Pistol. The Tokyo Marui G19 GBB is a said to be a well-built gas blowback pistol that is a faithful replica of the real Glock 19. It is mechanically and physically solid, and it is very accurate. The hop-up dial can be adjusted for added precision.