An exclusive collaboration between AirTac Customs and Retro Arms!
Need the perfect hopup to use with a CRBN Upper without breaking the bank? The Retro Arms M4 Hopup is a fan favorite and has drop-in fitment with our CRBN Uppers!
The hopup comes in a sleek black anodized aluminum with a laser-engraved AirTac Logo!
This AirTac Customs x Retro Arms CNC Aluminum M4 Hopup includes:
AirTac x RA Hopup:
- Complete CNC construction with Black Anodized finish
- Removable CNC Brass Side Wings for perfect alignment in any receiver (and perfect fitment in a CRBN Upper)
- Removable brass spacer to adjust nozzle length for HPA or AEG replicas
- Aluminum Rotary Dial Knob for fine hopup adjustments
-
4mm and 6mm bucking nubs to keep BBs shooting accurately and consistently on every single shot
- Extra nubs compatible with any hopping setup
Compatibility: