Introducing the Gen 4 HPA CRBN Uppers - a new level of durability!
Airtac CRBN HPA Upper for M4 AEG bodies.
Turn your AEG into a HPA speedsoft monster build with this fancy upper from Airtac Customs USA.
Designed and made by Airtac Customs in USA, this is a nice uppper that combines style with efficient ergonomics.
Made from a carbon fiber tube with a custom designed and 3D printed chassis that includes fiber rod front and rear sights. And it goes without saying that the carbon fiber body is extremely light and strong!
The frontsight holds a CNC aluminium endcap with 14mm CCW threading, ready for installing suppressor or tracer.
The CRBN HPA uppers are available in a multitude of colors; red, black, purple, silver and more.
With a rotary hopup, it is easy to adjust the hopup through the window cuts on either side of the body.
Important note about installation and compatibility
As the CRBN HPA Upper is a an aftermarket part for various AEG/HPA receivers, it may have different compatibilities with the other different parts it interfaces with.
Below is a general guide on what has been tested by Airtac Customs USA.
Regardless, this is a product that that sees the best success when installed by a professional technician.
Due to the removal of charging handle groove, the CRBN HPA upper is not compatible with most AEG gearboxes without modification to the gearbox.
Please see below for details.
Lower Receiver Compatibility:
-G&G Polymer (SSG1, ARP9 etc) and G&G metal lowers
-Lancer Tactical AEG's
-Some Specna Arms AEG's
Hopup Chamber Compatibility:
-MAXX Hopup unit
-Retro Arms Rotary
-G&G stock (with modification)
-ProWin chamber (with modification)
-In general, most hopup units should fit
Gearbox compatibility:
-Airtac Customs CRBN Gearbox
-Polarstar Fusion gearbox/engine (full GB replacement engine)
-Gearboxes with the top part machined off (see CRBN gearbox)
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