RA-Tech presents in a video their latest custom work. Their custom WE M16 Open Bolt has a new trigger set, firing pin, and the NPAS. The other custom work that they also did is on the KWC M1911 and the KWC 226-S5 Model. Check the video below to find out more how the improvements to these gas blowback airsoft guns or head off to their website how to get these into your hands.