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HAO's HK416A5 Enhanced Castle Nut for UN18 thread stock. 

Made from S45C steel bar and black oxided, which is fully compaitble with RS/ PTW stock thread. 

HK416A5 Enhanced Castle Nut

SKU: A58
    • S45C carbon steel 
    • CNC turned 
    • Black Oxided 
    • UN18 thread (PTW/RS compatible)
  • Term Of Use:
    All the products are made and design for Airsoft use. Any modification of structure, exterior, appearance or painting, marking or wiping the cover/instruction on the merchandise may lead to violate your nation's law regulation. Customers shall bear the full legal liability after the modification.

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