The King Arms M4 Training Weapon System (TWS) are available at Airsoft GI, and there are three Ultra Grades to choose from. For this Airsoft GI Uncut video, Cisco goes for the compact version King Arms KA TWS Type 3 Ultra Grade M4 AEG which just like its bigger brothers, has a Nylon Fibre, Troy Sight, and High Performance version 2 MOSFET.