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JG Complete 8mm Ver. 2 Gearbox for M4/M16 Series Airsoft AEG - Rear Wired

ID: 30141 (GB-8mm-M4-B)
4.3 stars, based on 21 reviews
JG Complete 8mm Ver. 2  Gearbox for M4/M16 Series Airsoft AEG - Rear Wired
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.

Complete 8mm Ver. 2 Gearbox for M4/M16 Series Airsoft AEG - Rear Wired


  • Wired to the rear
  • 8mm metal bushings
  • Ball bearing metal piston guide
  • Reinforced gearbox shell
  • Low resistance wiring
  • Reinforced JG gearset
  • 370~460 estimated FPS
Connector Type: Small Tamiya
Compatibility: Most Version 2 Airsoft AEGs
Material: Metal alloy, Low resistance wiring

Manufacturer: JG

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About CYMA

CYMA is among the oldest, most experienced and the largest Airsoft manufacturing facility in the world. Known for their unmatched quality control and professionalism, CYMA is selected to be the OEM of a vast amount of Airsoft products. Durability and performance meets affordability!

21 Customer Reviews

(Write a review)

by Dominic A. on 11/21/2016
"This is a pretty good gearbox. The parts are decent quality and its is pretty easy to open up and work with. But.. There was almost no air seal in mine so I had to stretch out the O-ring on the piston head. After that, there was a decent air seal with the parts the gearbox came with. Another thing is the spring is pretty strong. After a little bit of messing with air seal its a pretty good gearbox.
by Travis L. on 10/15/2016
"This is a piece of junk. Piston had no seal on on it, dropped FPS. The leads were poop and snapped as I put them onto the motor. Save your money and buy something worth while.
by James M. on 07/09/2016
"*Reviewer below me didn't check his compression*
For 50 Dollars here's what you get:
-ported brass cylinder (doesn't need replacing unless you're running a really long barrel)
-1 steel tooth piston (White) + white piston head with compression o-ring (it's alright)
-White cylinder head w/ 1 o-ring (Horrible, replace it)
-Clear nozzle w/ no o-ring (garbage)
-JG 18:1 steel gear set
-Oil retaining bushings
-metal ball bearing spring guide
-Appears to be a Fuse integrated into the wiring
Can't speak about the spring strength and wiring because I replaced them right off the bat.

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