5KU AEG Barrel Type CNC Hop Up Chamber for WA M4 Series


  • Model: AS4105
  • Manufactured by: 5KU


  • 5KU Hop Up Chamber Unit.
  • Rear adjustment.
  • Full metal construction.
  • For WA/G&P WOC M4 series airsoft GBB rifle with AEG type barrel.
  • Replace Western Arms M4 series gas blow back rifle original Hop Up unit.
  • Accomplish to use with AEG type inner barrel.
  • As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed.


  • 5KU model no. - GB-121
  • Weight - 28g
  • Built Material - Full metal construction
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    This product was added to our catalog on Wednesday 20 July, 2011.

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    Disclaimer: All airsoft guns, gas blowback guns, spring guns are NOT real firearms. All airsoft guns sold to US customers are affixed with an orange tip permanently.