According to the Kyaneko Brothers, they tried using a Tokyo Marui MK18 Mod.1 MWS GBB that has the RA Tech NPAS Ki and he reports that it's crazy, which we take it to be a very positive outcome. Mainly available from the Airsoft Taiwan store, the NPAS Kit, allows one to adjut the FPS of the MWS GBB to meet site limits. This two-part loading nozzle fits most Marui GBBs with the MWS system.