Retro Arms - M4 - 9mm QSC Gearbox Shell

Sale price$ 119.95

Pickup currently unavailable at Gilbert Arena


  • CNC Gearbox Shell G
  • 9mm Bearings/Bushings Compatible
  • Quick change spring guide system with Included spring guide
  • Screws included
  • Deeper wire channels along gearbox base
  • Pre-radiused cylinder windows to distribute impact force


Part Number 7121
Material CNC Billet Aluminum
Color Black or Silver (Depending on Manufactures Batch)
Manufacturer Retro Arms
Compatibility V2 Gearbox AEG Rifles.  Will not work with Ares/Elite Force/S&T gearboxes that use microswitch proprietary trigger switch.  Contact technicians with any questions.

DISCLAIMER: Please use discretion when installing custom parts as fit and compatibility may vary. Some modification may be required. Professional installation recommended.

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