JM Gen8 Gen9 Gen10 Upgrade Gearbox Parts

Transform your JM blaster into a high-speed, high-FPS beast with this complete metal gearbox overhaul – 3x more durable than stock parts!

✔ Two Customized Kits Available:
J8 Package ( jm gen8 m4a1  /SCAR):

• 18:1 Steel Gears

• Metal-Rack Piston

• Steel Cylinder

• 30,000 RPM 460 Motor

• 1.2mm Hardened Spring

J9/J10 Package (Gen9/10 Models):

• 18:1 Steel Gears

• Metal-Rack Piston

• Steel Cylinder

• 45,000 RPM 470 Motor (Ultra-Torque)

• 1.2mm Hardened Spring

Why This Kit Wins:

• Eliminates plastic gear failures

• Boosts FPS by 20%+ with optimized air compression

• Faster trigger response from high-speed motors

🎥 Watch Installation: