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AIRSOFTCON 2026 - October 17, 2026

G&P Full Metal M4 WOC Airsoft Gas Blowback Rifle Challenge Kit
(Model: Blank Receiver)

ID: 35717 (Kit-GP-WOK001-SF-L)
WOK001-SF-L - Black Receiver
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This item features a blank receiver with no markings on either side. Trademarked rifles/receivers shown for reference. Magpul CTR Stock, Magpul PMAG, Vertical Grip, Surefire Mock Silencer, RIS, and Sling Adapter not included
G&P

$230.00

This item is currently Sold Out

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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Order within 4 hours 44 minutes Receive as soon as Sat Aug. 8 with Free Shipping

Product Description

Features

  • 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
This is the ultimate in DIY Challenge Kits from G&P. This Evike.com 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.
Evike.com 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.

Manufacturer: G&P

FPS: 1

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
**To comply with US Federal Regulations, all kits will come with a blaze orange muzzle device permanently affixed to the outer barrel.

Product Specifications

Length: 760mm / 840mm (29"-33"), Adjustable
Weight: 2812g (6.2lbs)
Inner Barrel: 300mm
Magazine Capacity: 39rds. Works with G&P, Western Arms, King Arms and other compatible M4 / M16 Series Airsoft GBB Magazines
Muzzle Velocity: 340~380 FPS (Measured with 0.20g BBs and Green Gas)
Thread Direction: 14mm positive (+)
Gas Type: Green Gas
Fire Modes: Semi/Full-Auto, Safety
Hopup: Yes, Adjustable

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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.