G&g complete gearbox for m16/cqb blowback

Deluxe model with 8mm ball bearing and ultra custom internal parts
fully assembled with blowback system installed
ideal to upgrade and improve the internal gun quality
for g&g blowback models only

INTERNAL PARTS INSTALLED
-8mm steel ball bearing
-hi protection and resistance steel gear set
-reinforced piston with ventilated piston head
-power spring with air floss regenaration
-ball bearing spring guide
-steel cylinder and cylinder head
-safety lever and movable bolt are installed