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G&P M4 WOC "Navy Seal Skull-Frog" GBB Airsoft Gas Blowback Rifle Challenge Kit (M4A1)

ID: 35717 (Kit-GP-WOK001-SF-L)
4.8 stars, based on 17 reviews
G&P M4 WOC Navy Seal Skull-Frog GBB Airsoft Gas Blowback Rifle Challenge Kit (M4A1)
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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.
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This is the ultimate in DIY Challenge Kits from G&P. This Exclusive kit comes with everything you need besides the magazine to make a fully functional G&P M4 WOC Full Metal GBB. Your opportunity to own a high quality G&P GBB M4 at a fraction of the normal price.

Update: This G&P M4 WOC Kit comes with the newly designed nozzle more efficient system as you will see. The manual still shows the old type nozzle but the kit will come with the new type!

What comes with this kit?
The G&P M4A1 Challenge Kit comes with all of the internal parts necessary including the Blowback System parts, Hopup System Parts, Barrel Assembly Parts, Receiver, Foregrip, Front and Rear Sights, Buffer Tube and Stock System.

Will I need to assemble anything?
The G&P Challenge kit is meant a Do-It-Yourself kit for highly experienced players and comes completely disassembled. You will need a solid grasp on the inner and outer parts of Western Arms style M4 GBB's to be able to complete this kit. will not be responsible for any mishandling, damage, or other issues caused by the purchaser's inexperience or lack of knowledge on building this kit.

Compatibility: The G&P M4 GBB Challenge Kit is Western Arms compatible and can be used with Western Arms upgrade parts. Keep in mind, like any aftermarket parts, some modification may be required.

Does it come with a Magazine?
No, the G&P M4 GBB Challenge kit does not include a magazine. Thus G&P is able to export this item to you at great cost without it being "a complete gun" while saving you assembling cost at the same time for those that knows their M4 GBB.

G&P magazines available here at

Disclaimer: The supplied manual includes instructions on installation of the outdated Nozzle design. The updated Nozzle has been illustrated below.

*G&P Challenge kit does not come assembled and does not include a magazine

*Magpul CTR Stock, Magpul PMAG, Vertical Grip, Surefire Mock Silencer, RIS, and Sling Adapter not included

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.

* custom guns are build to order by our team of industry leading technicians. Custom guns may require one additional business days to construct, QC, and ship.

* custom guns are build to order by our team of industry leading technicians. Custom guns may require one additional business days to construct, QC, and ship.

FPS: 1

17 Customer Reviews

(Write a review)

by Robert v. on 09/28/2016
"This is a amazing gbbr if you have tech skill to assemble this rifle its great and if you upgrade the internals to steel and fine tune its a beast i love it and recommend buying it with the exception that the buyers have patience and knowledge of assembling small parts and springs instructions are easy to follow if you can follow a plastic model car or similar instructions you can build this you will need to do some file sanding etc tuning is highly recommended if done right you will love it!!!
by Ryan C. on 04/24/2016
"This thing was quite an experience to build. The little Allen screw that's used to tighten down the front sight stripped due to the fact that the material is so thin. It was an easy fix though, just used a beefier Allen screw to replace it. And also just a heads up, my receiver has the skull frog logo but does not have the punisher skull or navy trademarks so just beware of that. After it was finished, this thing is a beast. It has a nice weight to it and it hits hard. I had no experience at all with gbbrs and it wasn't as difficult as I had thought it would be. So if you're hesitant to buy this because you're not sure you'll be able to build it, just buy it. It just takes a little tinkering and mechanical knowledge to get it together. There's also a million different ways you can customized me upgrade this with after market parts. Overall, a great buy, well worth the money in my opinion
by Matthew H. on 03/10/2016
"Fun to build, came with all the parts, though I'm currently waiting on an NPAS unit before finishing the assembly. Well built. Excellent finish. Be careful about the trigger guard install, in my infinite wisdom I tried forcing the retaining screw for the fromt half of it through with the outside of a leatherman multi tool. The end result was I am now missing a large chunk of skin on my knuckle just above my right thumb. Point is be careful. The kit was incredibly easy to assemble, the instructions are like that of a Lego kit. Just get some snap ring pliers, a nail, mallet, pliers, allen keys, a metal file, and a ton of lube, ignore the cashiers strange looks at your local Wal Mart and you're good to go, all set to get into a hot sweaty, back aching, hand stinging, wrestling match with the auto sear and delta ring, parting the lips of your magazine, and filing down the loading nozzle till it all lies flatter and smoother than 9 month old Coke. Overall. It was fun.

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