G-SERIES 19 GEN 5 GBBThe main difference on the Gen 5 is that it features more rounded edges on the front, making it easier to holster and magazine changing is also easier with a thumb cut out at the lower front of the Pistol Grip. There is also the addition of an ambidextrous Slide Release, which is great news for Left Handed fans of this platform. Full Metal slide and ABS Frame. Gas Blow Back Pistol with Semi Automatic Shooting Mode. Extreme smooth slide cycling and a