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G&P Full Metal M4 WOC GBB Airsoft Gas Blowback Rifle Challenge Kit (Model: Zombie Killer / CQB)

ID: 58421 (Kit-WOK001-WP08-S)
4.6 stars, based on 34 reviews
G&P Full Metal M4 WOC GBB Airsoft Gas Blowback Rifle Challenge Kit (Model: Zombie Killer / CQB)
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$230.00 $207.00

This item is currently Out of Stock Usually restocked within 1-3 weeks.
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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.
CanadaExport Compliant
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.

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G&P gas blowback rifles have long been considered one of the best GBBR platforms around, the G&P WOC challenge kit is the ultimate in DIY Airsoft Construction. Designed for advanced airsofters the WOC kit comes with everything you need to build your very own G&P gas blowback M4A1, with the exception of a magazine, which must be purchased separately. Compatible with the Western Arms system the WOC kit can be customized to fit any needs that the player may have.


  • Completely disassembled challenge kit is the ultimate DIY Airsoft kit
  • All parts necessary to build a functioning G&P GBBR are included, with the exception of a magazine
  • Full metal receiver, barrel assembly and buffer tube
  • Compatible with Western Arms parts and accessories
  • Designed with experienced airsofters in mind
  • Magazine NOT included
Inner Barrel Length: 300mm
Outer Barrel Length: 12.5"
Compatibility: G&P, Western Arms parts and accessories
Material: Aluminum alloy, injection molded polymer

Manufacturer: G&P

FPS: 400

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.

34 Customer Reviews

(Write a review)

by Stephen L. on 01/08/2018
"I will start by saying this is my first gas airsoft rifle. I have a couple gbb pistols but had no rifles. I had no previous knowledge of the inner workings- but, now I do. I was hesitant to buy this kit because of reading negative reviews. However, I really wanted a gbbr but couldn't give my wife a reasonable explanation that made spending $400+ okay. I will end up with that spent, but it's easier to do $20 at a time.
The kit was nicely packaged with all pieces of a particular part grouped together- trigger, hammer, bolt catch etc. I wasn't missing any pieces nor did I have any leftover. The instruction booklet was very helpful, even though there were no written directions. They provided me with an order to the assembly and names of the parts I was assembling. I did go to the internet a couple times and was able to find what I needed. Thanks to having the proper names from the booklet.
I believe the makers of the kit have been reading and listening to the reviews. I was pleased with quality, still not steel, but zero plastic( other than the nozzle). Everything was neatly packaged and I had everything needed except a mag. and wasn't supposed to have one.
In my opinion, this kit is awesome. With a good bit of patience, a file and some sandpaper, you can come out on the other end with a very nice gbbr. Well worth my money and time.
by Jacy L. on 12/21/2017
"Great kit, I'm very happy with it.

One thing for folks to know is that G&P has been improving this kit over time. I bought a bunch of parts preemptively that I don't need because the kit already has them (or better parts).

The Navy Seal kit comes with:
- a different nozzle unit - it appears to be the upgraded unit
- the hammer is steel AND has roller. The roller is a very nice one, it's wide - much wider than the roller on the king arm or matrix hammer upgrades. I bought the matrix roller hammer upgrade assuming this kit did not have one, and it's clearly inferior to the one that comes in the kit.
- the trigger lock is steel and has bushings to stabilize it (better than the upgraded units out there)

Bad things still in the kit:
- The buffer lock is not steel, though unless you are upgrading the recoil spring, weight, and travel, I don't see why you need a steel one.
- Bolt catch is not steel
- Trigger is not steel
by andrew z. on 02/15/2017
"On first inspection this kit seemed complete but after I started to assemble this kit I realized that the recoil spring was missing. Easy fix once I called evike, they said they will try to locate it and if they did they can send it out to me, or if they can't find it within 2 days they will accept a return on my kit. I asked if they would just be able to send a replacement spring if they couldn't find the original due to the fact that the kit is mostly together already and the gentleman on the line said that that can be done also. Great customer support, within 15 minutes everything was sorted out.

Some of the internal parts of the kit seem low quality but I was aware of this going into the kit. This gun is a great gun if you want a project, as the assembly is not the easiest, but can be done with the manual and some effort. This is not a kit you will have done in a couple hours though, it's really is a challenge.

You will not need any experience building guns to buy this kit!!!!! Follow the instructions and you will be okay.

The amount of aftermarket and replacement parts for this gun is emense and I do not see myself getting bored of upgrading and changing the gun. I plan of getting more then one upper going at a time so I can have a very dynamic setup depending on the course/game.

The paint on the reciever of the gun is impeccable and I love the finish. G&P has done a great job detailing every part on the exterior of this kit and I am very impressed with the looks so far. If there is one thing I recommend getting with this kit other then the magazine (which is not included) is a rear sight, as the stock one is very poor in my opinion.

Overall- very impressed and happy with this kit and my first purchase on evike! Evike has been very helpful with finding the missing part and no other company has had customer support this good. 8/8 was gr8 m8

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This item is currently Out of Stock. Most out of stock items are restocked within 1-3 weeks. Some items may take longer. Please add this item to your wishlist to keep posted on its availability.