![Retro ARMS Airsoft M4 Charging Handle Extension - Silver [RETRO-6656] - $18.00 : BRILL ARMORY, Quality Airsoft parts for the discerning consumer. Retro ARMS Airsoft M4 Charging Handle Extension - Silver [RETRO-6656] - $18.00 : BRILL ARMORY, Quality Airsoft parts for the discerning consumer.](https://www.brillarmory.com/images/cncchargehandle_02.jpg)
Retro ARMS Airsoft M4 Charging Handle Extension - Silver [RETRO-6656] - $18.00 : BRILL ARMORY, Quality Airsoft parts for the discerning consumer.
![Concept for upgrade study – Dboys M4 + RetroArms split gearbox with integrated Hop-Up chamber | CNC Receiver, CNC gearbox, CNC airsoft upgrade parts - RetroArms Concept for upgrade study – Dboys M4 + RetroArms split gearbox with integrated Hop-Up chamber | CNC Receiver, CNC gearbox, CNC airsoft upgrade parts - RetroArms](https://www.retroarms.com/upload/dboys/retroarms-dboys-upgrade-split-cnc-gearsoft-airsoft-1.jpg)
Concept for upgrade study – Dboys M4 + RetroArms split gearbox with integrated Hop-Up chamber | CNC Receiver, CNC gearbox, CNC airsoft upgrade parts - RetroArms
![Retro ARMS Airsoft M4 Charging Handle Extension - Silver [RETRO-6656] - $18.00 : BRILL ARMORY, Quality Airsoft parts for the discerning consumer. Retro ARMS Airsoft M4 Charging Handle Extension - Silver [RETRO-6656] - $18.00 : BRILL ARMORY, Quality Airsoft parts for the discerning consumer.](https://www.brillarmory.com/images/cncchargehandle.jpg)