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2021 Update: All HAO PTW receiver begin marhing into the PTW Infinity compatible generation.

We have update the motor/grip area to use both Kumi motor and RS spec grip adaptor.(Pic3.)

The inner side of the lower reciever already adjust to fit the wiring for the Infinity gear box.(Pic4.)

Kit comes with the PTW Infinity RS Spec grip adapter.


CNC machined from an Alloy 7075-T6 billet which is as same material as real firearm.

This time we have developed a new ambidextrous structure for the PTW AR system, unlike the our 416A5 style structure . The ambidextrous on the BD556 ambi and RBR is more exquisite, it shows the craftsmanship of HAO's R&D dept.

(Photos not update yet)


You can find the Infinity spec safety selector here:



Anodizing / surface treatment disclaimer from Geissele for reference :


  • Made in Taiwan
  • BB type: 6mm 0.2g BBs
  • Power source: 11.1V PTW
  • Power: 90 m/s = 0.81J with 0.2g BBs
  • J / cm2:  2.835 J/cm2
  • No primer using function 


HAO BD556 ambi conversion kit for PTW

    • -CNC milled receivers from alloy 7075-T6 billet
    • -Fake pins
    • CNC drilled BD556 Ambi bolt catch
    • CNC drilled BD556 Ambi mag release
    • CNC lathed,drilled BD style Steel Black Takedown pins
    • PTW Infinity RS spec grip adapter
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