We pre-assemble these finest upper kit for your HAO BD556-KWA which allows you to switch form DMR to CQB(or reverse) setting fast in the game.


Kit including barrel 10.5"/14.5", HLR M-Lok Handguard 10.5"/14.5", BD Gas Block, SFCT flash hider.

** Compatible ONLY with HAO BD556 KWA lower and Gen1 KWA M4 GBBR lower **

BD556 Upper kit for KWA/KSC GBB (HAO & Gen1 KWA lower)

  • CNC milled upper receivers from alloy 7075-T6 billet
  • Alloy 6061T6 barrel (10.5"/14.5") (14mmCCW)
  • Alloy 7075-T6 milled Gasblock