Ultimate High Performance Gearbox Upgrade Kit for JM Gen. 8

This kit is the Ultimate High Performance Gearbox Upgrade Kit for JM Gen. 8.
.Refit requires some hands-on ability

Features:

• Compatible with JM gen8 models , including: M4A1, SCAR V2, MP5 V2, UMP45 etc
• Complete upgrade kit

Potential performance increase:

• Rate of fire: up to 20 rounds per second (depending on configuration)
• Shooting range: 30m+
• FPS 300+

Specification:

• Material: Nylon + ABS + Metal
• Package Dimensions: 27*16.5*5cm
• Package Weight: 390g

Package includes:

1 x Singularity Edition Nylon Gearbox Shell
6 x 8mm Bearings
1 x Silver-coated Wire Set (Including Microswitch)
1 x Aluminum Cylinder (Color Random)
1 x Metal Gear Set
1 x Metal 8-hole Piston Head (Color Random)
1 x All Metal Gear Nylon Ladder (Color Random)
1 x 1.2 Wire Diameter Spring
1 x Original Accessory
1 x 1.3 Wire Diameter Spring
1 x 27cm Aluminum Barrel

Please note: The reliability, and performance increase is dependent on the quality of the installation.

Professional installation is required.