FCW GBB Carbon Fiber MK12 Mod 0 Conversation Kit A (TM MWS Set Up) 
 
Carbon Fiber Made MK12 Mod SPR Style Front Hand Guard
Coming with MWS M16A2 Fixed Stock 
Metal Front Sight + Near Sight Rail System
Its kit can fit to other brand of GBBR when taking out HWS Outer Barrel Adapter