Airsoft España sent in this video review of the ATEi Slide and Outer Barrel Set made for the WE Airsoft G17 Gen 4 GBB Pistol... "This is the first part of the ATEI Style Video Upgrade of the Gen4 G17 Pistol from WE Airsoft. The changes are purely aesthetic, thanks to the change of the slide, outer barrel and frame with a SAI-Style trigger."