PRE ORDER The C amp;C Tac T651 CNC Hop Up System is a drop-in fit, robust hop-up chamber designed for the TM MWS M4/AR-15 GBBR. This hop-up chamber is made of robust and lightweight CNC aluminum and it is a great upgrade or replacement for the stock TM MWS hop-up chamber. Compatibility: TM M4 MWS Includes: x1 C amp;C Tac TM MWS GBBR T651 CNC Hop Up System (AIRSOFT USE ONLY)