Airsoft Taiwan now has the new TK.45 AEG  from the Ronin "Tekken" series from KWA. slender aluminum 10 inch M-LOK free float rail and KWA’s Kinetic Feedback System (KFS), or as the TK.45c AEG 2.5, with KWA’s Variable Performance System (VPS) unit which means the FPS can be adjusted to meet game field requirements. In this video they test this feature.