Announced previously and available at the Airsoft Taiwan online store are upgrade parts for WE, KSC, KWA, and Tokyo Marui airsoft guns made by the New Age Airsoft Brand. A video of available parts is made by AST and these can fit either WE M4, KSC/,KWA M9, and Tokyo Marui Hi-Capa Gas Blowback Airsoft guns.
Click here to check their product pages.