Here's another video from WGC Shop showing the performance of the VFC MP5 SD Gas Blowback SMG when upgraded with Azimuth Gas Blowback Upgrade Parts. The firing, though the audio recording didn't do justice to it, looks crisp and responsive. We don't know if WGC Shop will be selling an upgraded VFC MP5 SD GBB, but if you want to do the upgrade check the WGC online store for the Azimuth upgrade parts.