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G&P Complete M4 Metal Receiver & Gearbox Airsoft AEG ProKit (Skull Frog) - Rear Wire / Dark Earth

ID: 42015 (PROK-MK003-D)
4.3 stars, based on 3 reviews
G&P Complete M4 Metal Receiver & Gearbox Airsoft AEG ProKit (Skull Frog) - Rear Wire / Dark Earth
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Looking to build your dream AR-15 M4 M16 AEG without compromises? The G&P ProKit is dedicated to provide you the top selections of everything you need; and nothing you don't. Every G&P ProKit comes complete with a pre-assembled AR-15 M4 receiver, a fully tuned complete gearbox, G&P motor, motor grip, and integrated deans adapter low resistance wiring harness to start you off without compromises. All that's left between you and your custom dream build, will be a front-end of your choice and stock! The ProKit is a great start for the intermediate and advanced players who want to take advantage of the vast selection of m4 front end furniture and stocks available at The G&P gearbox, motor and receiver is globally recognized to be among the highest rated. Our chronograph, ROF meter, voltage and current meter have also verified that the G&P gearbox runs with lower resistance, a higher rate of fire (given same spring rating) and much smoother as the result of years of research and development G&P put into their performance parts.

Package Includes:

  • Skull Frog laser engraved metal receiver
  • G&P Award Winning 8mm Bearing Complete Gearbox (Rear Wiring)
  • Integrated high performance Standard Deans type T connectors
  • M4 Cocking Handle
  • New Dust Cover Set
  • Reinforced G&P Metal Bolt Cover / Receiver Pin Set / Forward Assist Knob / Selector / Magazine Catch
  • Reinforced G&P Metal M4 Trigger Guard / Bolt Stop
  • G&P M120 Motor and Motor Grip
Compatibility: The G&P ProKit is compatible with all major brands of M4 / M16 series front ends and stocks
Power: M120 (360~450 FPS depending on setup)
Wiring: Rear. Low Resistance High Gauge Anti-Heat Wiring Harness.
Plug Type: Standard Deans
Gearbox: 8mm Bearing Gearbox.
Motor: G&P High Performance high speed M120 motor.

Manufacturer: G&P

Things you may need to get started:
    Battery and Charger – Required to power your AEG; use a high quality battery and charger for best results.

    Spare Magazines – Stay in the fight longer by bringing more ammo with you.

    BBs – High quality precision 6mm BBs recommended; Use 0.20g – 0.25g BBs for best results.

    Silicone Oil – Basic cleaning and lubrication maintenance help keep your Airsoft AEG in top working order.

About G&P

Established in 1995, 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.

FPS Range: 360-450

3 Customer Reviews

(Write a review)

by Neal R. on 12/28/2015
"I'm guessing the guy above got a bad one out of the batch my receiver was perfect in every way bolt catch worked flawlessly , selector switch had a nice firm click on every selection the gearbox was shimmed darn close to perfect , with a 363 mm 6.01 tightbore and prowin hopup maple leaf bucking I was getting 447 fps perfect for dmr 👍 great gearbox high rate of fire the absolutely only con for this is the m120 motor has ferrite magnets which get extremely hot after one match my hand was burning on the grip it stung. i recommend buying a lonex a1 or tienly 45,000 motor and its good !!
by Kristian B. on 02/01/2014
"I would like to modify my original review as I was frustrated at a minor nuances but after looking at the receiver kit I let those minor things skew my view of the product. The receiver is not only visually appealing but it feels very solid, giving it a very realistic feel to any AEG you make out of it. The special Seal Team Six receiver engravings and the trigger guard are also a very nice touch. I one thing I didn't like and didn't expect was the fact that the bolt catch is non functioning, causing the bolt catch to rattle and fall out when breaking down the receivers in a breakdown case. Also the dust cover does not close due to a bulge in the part that clips on to the inside of the breach. Now here's the original problem & solution that caused me to be frustrated and write the negative review: The fake bolt has a bulge at the bottom of it that does not clear part of the inner upper receiver and it causes problems overall. the solution is to sand or file down the bottom of the fake bolt in order to allow the bolt to slide back and forth.


- Full metal (CNC Aluminum)
- One of the few Dark Earth full metal receivers
- Self retaining pin making it easy to field strip
- Inexpensive internal and external upgrade for a performance AEG
- Comes with M120 motor and Deans connector


- Have to modify the fake bolt to use the charging handle
- Dust cover does not close
- Bolt catch lever non-functioning, loose so it can be lost easily when field stripping
- Some Hop up units need to be modified to fit alongside the gearbox.
by Kristian B. on 01/30/2014
"I got this receiver kit hoping for good internals and externals. I can honestly say that the receiver itself feels very solid but there were a few things I couldn't ignore.

Pros: Solid construction

Cons: Bolt and charging handle have too much resistance, do not fit well
- Bolt release does not function like most G&P guns
- Selector switch is not responsive.

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