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G&P Complete M4 Metal Receiver & Gearbox Airsoft AEG ProKit (Skull Frog) (Version: Rear Wire / Black)

ID: 42014 (PROK-MK003-B)
4.5 stars, based on 13 reviews
G&P Complete M4 Metal Receiver & Gearbox Airsoft AEG ProKit (Skull Frog) (Version: Rear Wire / Black)
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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 hearbox (Wired to rear w/ Standard Deans)
  • Integrated high performance Standard Deans type T connectors
  • M4 charging 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
  • High speed motor pistol grip
  • *If you are looking to build your dream AEG with the front-end, RIS, and stock of your choice: This kit comes complete with everything you need! The gearbox and metal receiver assembly are all pr-assembled!
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)
Laser Engraving: Skull Frog
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.

FPS Range: 360-450

California residents click here for Proposition 65 warning

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.

13 Customer Reviews

(Write a review)

by Bill B. on 05/13/2017
"This is my review of my very own G&P Skull Frog Gearbox and Receiver. Yours may be different:

-Very nice and sturdy construction
-Cool trades
-Different Trigger guard from your standard M4
-Nice ROF out-of-box with 7.4 1200mAH
-Around 420-400 fps (depends on barrel)
-Relatively straight-forward compatibility & assembly with various RISes and outer barrels, as well as stocks.

Now, for the cons... (does not outweigh Pros in my opinion)
-Charging handle. The spring seems longer than necessary, and bunches up when smushed together with the lower, complicating putting in a hop-up and getting good air-seal.
-Bolt catch does not function (not really super bad, just a little realism would be cool)
-Dust cover does not lock into place.
-Pro-Win HO is a little finicky, may just be mind though.
-Piston made need an upgrade

Overall, 4.3/5. Extremely impressed with exterior quality, interior is normal G&P quality, however a chain is as strong as it's weakest link. Would recommend a new piston for AOE, but it's not a huge issue until you put a lot of rounds in it.
by Lawrence T. on 01/18/2017
"Excellent rps and rang, I absolutely love it very strong and dependable.
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 !!

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