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G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: i5 Rear Wired V2 / Standard Deans / Full Auto)

ID: 39750 (GB-GP-EV-GB003B)
4.5 stars, based on 19 reviews
G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: i5 Rear Wired V2 / Standard Deans / Full Auto)
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$109.00 $70.85

This item is currently Sold Out

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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.


  • Drop in upgraded gearbox works with most M4/M16 receivers as well as other AEGs that utilize a version 2 gearbox
  • Durable, reinforced G&P construction ensures reliable operation and lifespan as well as easy to replace, upgradeable components
  • Complete gearbox
  • 8mm steel bearings. steel gears and numerous high grade components make this one of the most reliable gearboxes on the market
  • Utilizes screw type motor connectors
  • Designed for Full Auto only
Power: ~400 + FPS
Wiring and Connector: Front wired with a standard Deans plug
Compatibility: Most popular M4/M16 series AEGs or other AEGs that utilize a Version 2 gearbox
Material: Aluminum, Steel, Metal Alloy

Manufacturer: G&P

About G&P

G&P is among the oldest Military-simulation and training Airsoft manufacturers in the world. Started as a top combat light provider for law enforcement and military agencies around the world, G&P branched into Airsoft manufacturing with the same belief to never sacrifice quality for lower price. Their motto is visible on every G&P product. Every G&P AEG rifle is hand assembled and individually fine-tuned by top technicians in the industry to match G&P's unparalleled quality and reputation. G&P utilizes CNC precision machining and real-steel finish/coating processes on many of their products.

19 Customer Reviews

(Write a review)

by Brian C. on 08/11/2017
"Very happy with this gearbox. Put it in my completely stock G&G Combat Machine. It did require a little work to get it in. I could have used the thinner wires that came with the gun, but wanted to use the thicker and more flexible ones the gearbox came with.

FPS: I have had it chronoed with 0.20 bbs. Came in at 330 fps. I have another completely stock G&G Combat Machine that comes in consistently at 350, so this is a little slower... but MUCH quieter and smoother. The trigger response is infinity better even with the stock motor.

I plan on switching to an M120 spring and high torque high speed motor. That ought to get me closer to the 400 FPS limit of my local field.
by matthew s. on 02/09/2016
"Got this for my g&g cm16. Dropped right in with a little snug fit. Had to do some wire splicing for the battery. The motor wiring is a little different so if you're doing this for your g&g then you'll also need a better torque motor and I'm investing in a more qualified handgrip too
by Carl S. on 09/30/2015
"This is a very nice and high quality gearbox. I would though recommend re-shimming the gearbox and putting new silicone oil and teflon grease inside it. In my gearbox the bevel gear was not shimmed properly at all. I would also recommend switching the motor connectors to the more universal type motor connectors. It also comes preassembled and is packaged in a box with bubble wrap around it.

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