This is a Version 2 M130 Spring Gearbox from JG complete with MOSFET. It is wired to the front, designed for the M4, and with the M130 Spring rating should shoot around 400 FPS if properly installed. Don't worry about upgrading piece by piece, JG has done all the work for you in one complete package. By getting the complete gearbox you've rid yourself of worrying about parts compatibility and function. This entire gearbox is made from and assembled by the same company, so you know they did it right.
MOSFET does not come installed. Airsoft GI recommends professional installation for this product. Motor is not included
just got the unit and droped it in my m4 and first thing that happen was my piston stripped on front teeth. not so happy. I live far away from air soft gi , so it was faster to swap out the part and get it going. after that i found out that my modify hop up dosent fit into the front case. little thing. after all that when it was fdone it fired nice. Im 50/50 on it.
wires at motor are to long
front air nozzel has no seal
First thing you should know is the gears inside are only lightly greased or not at all so you'll need to grease it.
This gearbox is solid I mean solid like a rock! Wireing the mosfet is easy just connect the four wires from the mosfet to the four front wires on the gearbox, but its up to you to find the place to hide the mosfet.t and you'll need to hook up the mosfet to connect to the battery. Because the battry connector is on the mosfet. So what I did was order the large peq box from AIRSOFT.GI.com and stuck the mosfet and baterry in the battery box simple as that. You might come up with other ways to do it.
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