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G&P M4A1 WOC "Zombie Killer" GBB Airsoft Rifle Challenge Kit - Short Barrel

ID: 58421 (Kit-WOK001-WP08-S)
4.0 stars, based on 1 reviews
G&P M4A1 WOC Zombie Killer GBB Airsoft Rifle Challenge Kit - Short Barrel
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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

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.

1 Customer Review

(Write a review)

by justin h. on 12/03/2016
"I bought this exact kit 3 years ago, took me a good 6 hours to build it and it did not work once it was done. The magazine I purchased with the kit (since the kit does not include one) was a standard mag by King Arms and it was awful. I picked up a G&P PMAG and the rifle worked pretty well after that, now I have filed the magazine well so it is wider to fit GHK G5 mags and I recommend them over the other two options. Right from the beginning the buffer tooth broke in half so every time I field stripped the rifle the buffer and buffer spring flung out, doesn't effect functionality just annoying. The bolt carrier and nozzle assembly are not very good out of the box so I picked up a King Arms High Power bolt for field play and those work 100% wonderful. I never liked auto on gas rifles so I bent the hammer spring forward so that it's tension is much higher and you can clearly here a loud "clink" when dry fired. This tension makes semi auto fire every time regardless of temperature outside but auto will not work correctly. With a bit of testing i'm sure you can find a perfect middle ground between the two. Over time I replaced the hammer, trigger and auto sear with steel components and would recommend doing so to anyone thinking about these kits but note that if you run a steel hammer make sure it has the roller bearing on top or it can rub the aluminum bolt and cause quick wear. My charging handle broke in half as well so now I need one of those but other than that it functions great on semi and I love the feel of using this weapon in game. I bought a MAGPUL challenge kit as well and that one worked great out of the box, but that was a newer release so maybe these newer kits will work out of the box with just the G&P mags. My hop up and barrel are still stock and I don't mind them at all. The barrel is accurate and the hop up never adjust unintentionally so I love that once it's set it never moves on you. I also leave my barrel stock because if I go tighter that KA High Power Bolt and Nozzle will make this rifle fire in the high 400fps range and that's to high for a CQB size M4. It already is around 400 with .25 gram BBs.

Conclusion, if you want a rifle you can say you built this is a great one. I'll list a recap of what I needed right away.

- G&P PMAG(or modify to GHK G5 mags)
- Steel Buffer Stop(not required to fire but will break)
- Stronger Charging Handle(real steel works with minor grinding of side flanges.
- King Arms High Power Bolt and Nozzle

There are many wonderful parts for these rifles over seas as well, but to get this rifle out on the field these are all things you can do through Evike and some custom work. Hope this review was helpful.

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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.