Got money to burn for an upgrade kit for your WE Airsoft & GHK GBB Systems for AR-style airsoft rifles? RA-Tech would be happy to get your cash with their RA-TECH URGI/MK16 GBB 10.3" Kits that cost US$930.00 according to the Airsoft Taiwan store. This contains upgrade parts from RA-Tech, Z-Parts, Maple Leaf, Angry Gun, and New Age. Check them out in the video below: