SYSTEMA Mecha-Box (Gearbox) 1J (High Speed) for Tokyo Marui MP5A4/ A5/ SD5/ SD6

Complete reinforced and upgraded gearboxes from Systema. Quality parts and thoroughly tested by Systema's technicians, these gearboxes are ready to be dropped directly into your AEG for instant upgrade configurations. Teflon coated parts ensure smooth operation. Trust your gun to nothing less than the best in the Airsoft Upgrades Business - SYSTEMA