This is a complete Version 2 Gearbox from JG. It is wired to the front, designed for the M4, and with the M130 Spring rating should shoot around 400 FPS if properly installed. Dont worry about upgrading piece by piece, JG has done all the work for you in one complete package. By getting the complete gearbox youve rid yourself of worrying about parts compatibility and function. This entire gearbox is made from and assembled by the same , so you know they did it right.
- OEM Replacement
- Drop-In Gearbox for M4 / M16
- Front Wired
- Includes: One (1) Complete Gearbox