NextGen Retros shows how to install the Feda Valve/NPAS and Bavtac Nub made for the Tokyo Marui M4 MWS gas blowback rifle. The FEDA Valve, meaning Fast, Easy & Direct Adjustment Valve, offers a straightforward way to control power levels in your TM MWS replica. Using a simple 1.5mm Allen key (included), you can quickly fine-tune performance. Compatible with Tokyo Marui, Guns Modify, Unicorn, and BJ Tac nozzles, this valve installs like any other for the TM MWS system, requiring no special treatment. Note that Double Eagle or Cyma CGS Noveske N4 nozzles currently need modification for compatibility.