JG M4 Upgraded M130 Full Metal Pre-Wired For MOSFET Gearbox

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Upgraded version 2 gearbox from JG. This full metal, front wired gearbox is pre-upgraded by JG with an M130 spring and MOSFET signal wire set. This drop-in gearbox is prewired for the installation of a MOSFET of your choice. Installing a MOSFET with this gearbox will greatly improve the lifespan of trigger contacts and other parts.

Note: MOSFET not included

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