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G&P Full Metal M4 WOC GBB Airsoft Gas Blowback Rifle Challenge Kit (Model: Magpul Desert Storm)

ID: 39321 (Kit-WOK002-DE)
5.0 stars, based on 6 reviews
G&P Full Metal M4 WOC GBB Airsoft Gas Blowback Rifle Challenge Kit (Model: Magpul Desert Storm)
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$300.00 $246.00

Sorry, this item is Discontinued

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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Model Options:
*This is a challenge kit and the rifle will come "not assembled"
G&P WOC "Magpul M4 Desert Storm Custom" Airsoft Gas Blowback GBB Rifle Challenge Kit

This is the ultimate in DIY Challenge Kits from G&P. This Exclusive kit comes with everything you need including a very awesome PMAG GBB magazine to make a fully functional G&P Custom M4 WOC Full Metal GBB. Your opportunity to own a high quality G&P GBB M4 at a fraction of the normal price.

Weight: 3300g
Kit Includes:
-WA Magpul Type Metal Body (Sand) (WP140S)
-Magpul PTS MOE Handguard Kit (Dark Earth)
-WA Magpul Gas Blowback Magazine (39rds) (Sand) (WP159S)
-WA M4A1 Aluminum Outer Barrel (WP49)
-Precision Brass Inner Barrel
-M4 Flashider (Clockwise) (GP087C)
-Magpul PTS MOE Grip (Dark Earth)
-Magpul Rear Sight (Dark Earth)
-WA 6 Position Stock Pipe (WP59)
-Magpul PTS MOE Stock (Dark Earth)
-WA Steel Stock Ring (WP26)
-WA M4A1 Pipe Ring (WP30)
-WA Hammer Set (WP11)
-WA M4 Sear
-WA M4 Bearing Hammer Pin Set
-WA Bolt Stop
-WA SPR Type Cocking Handle (WP52)
-WA M4 Hammer Lock (WP57)
-WA Magazine Catch
-WA Selector
-WA Forward Assist
-WA M4 Speed Buffer (WP154)
-WA Bolt Carrier (Negative Pressure)

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?
Yes, the G&P Magpul MOE M4 GBB Challenge kit DOES include a very awesome M4 Magpul PMAG GBB magazine.

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.

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.

* 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.

6 Customer Reviews

(Write a review)

by Rodrigo L. on 11/06/2013
"I just received this kit today and finished within 4 hours of work.

Building this awesome kit was very entertaining and very educational, since i work as an airsoft technician and this helps me understand how m4 gbb work.

Dont expect this kit to work smooth when you finish asembling it, it needs some sanding and LOTS of oil to help the gun wear itself to make it run like it should... remember this is a challenge kit, its supposed that you make some effort putting this together as it should, once it starts running smootly well.. i just gotta say i fell in love with this thing.

Mag efficiency is awesome, holding enough gas for about 80 rounds.. mags take 39 bbs each.

Things to get as MUST, are Hammer with bearing, Sear, Buffer Lock, Bolt catch , all of them made from steel, since the ones that come with the kit wear down easily because they are made from aluminum.

I havent field tested it but overall i would definetively recommend this.. Man id even buy another one just for the fun and challenge of building it!
by andrew b. on 03/13/2013
"I have recently purchased this kit and it is very awesome, after 2000 rounds the only thing to break is the buffer lock, and a steel replacement is only $10 so I can not complain to much. If your are wary of getting this gun because you have to build it DON'T BE!!!! It is extremely easy to put together and I have a very en depth step to step procedure of how to put it together

Easy to assemble.
Two nozzles, one for 300fps and another for 350fps.
Solid construction.
Upper and lower receivers may be wobbly against each other, however it varies, in one of my kits the upper and lower meet very tightly and then my other kit has a pretty sloppy fit.
G&P Pmags will need modified to work in the gun, either modify the gun or the mag catch, again this video can be found on my you-tube channel if you want to know how to fix this.
Great looking gun and after you get the mag or mag catch modified it works like a charm! I have nothing but absolutely great things to say about these kits. If you are on the fence about getting one of these kits do it! They are only a fraction of the cost of a assembled one, plus if you put your gun together to start with you will better understand the weapon, and be better able to fix and maintain it in the future.
by Chris P. on 01/30/2013
"I got this gun a few days ago and its awesome. It took me about 2.5/3 hours to put it together ( I accidently messed up putting the outer barrel on and I couldnt get it off.) Anyway: I didnt recieve a pin to put the auto hammer lock in, the buffer lock broke immedately and the mag has problems. As far as the provided pmag, the bolt gets caught on the black rubber valve on the magazine. Despite those things its a great gun and im sure its fun to shoot (didnt shoot it yet). Also, if your worried about some assembly or any peices they were different than in the picture and in the videos we all watched on youtube: The bolt was COMPLEATELY assembled *woot woot* no need to assemble the nozzle, the buffer is wayy different, rather than a speed buffer or silver solid one, its a black one with a hole in the middle. Lastly, the hard hop up bucking everyone complains about is rubber, super super soft rubber.

Easy to put together
Magpuled out
comes with a magazine
full metal
new pieces

No auto hammer lock pin
buffer lock broke (upgrade to steal immedately)
magazine valve needs a replacement

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This item is Discontinued.