KA M4A1 Nylon Fiber Rifle with GHK GBB Kit


This Colt M4A1 rifle has the outstanding GHK Gas Blowback system as standard…

SKU: KA-AG-105-1 Categories: , ,



This Colt M4A1 rifle has the GHK Gas Blowback system installed as standard. It is equipped with a Nylon Fibre receiver to reduce the rifle weight and high-grade Aluminum tactical rail to install accessories. The hand guard is ABS and offers a lightweight but sturdy option. This rifle is an officially licensed product with full trademarks and logo (licensed from Cybergun). Green gas is recommended to be used on this GBB. The package comes with a 40 rounds magazine. This rifle GBB system can be interchanged with KA M4 AEG gearbox so the user can enjoy a good GBB and AEG experience from the same rifle.


Suggested Energy Source: Green Gas

Max Overall Length: 850 mm

Min Overall Length: 770 mm

Inner Barrel Length: 368 mm

Weight without Magazine: 2220 g

Main Material: Zinc Alloy & Nylon Fiber

Capacity: 40 Rounds

Calibre: 6 mm

Fire Mode: Safe / Single / Full-Auto

Loading Mode: Automatic

Blowback Action: Gas Blowback

Magazine Release Design: Single-Way

Hop-Up: Adjustable AEG Type

Gearbox Design: GHK GBB Box

Accessories come with package: BB Loader

Muzzle Velocity 366 FPS

Additional information



Power Type




UK MainlandPriority Delivery1-2 Working Days£7.00
Standard Delivery3-5 Working Days£5.00
Saturday Delivery Order Before Thursday £20.00
Free Delivery4-5 Working DaysOrders Over £150
Buy and Collect30 Min After Ordering £0.00
Scottish HighlandsStandard Delivery 4-5 Working Days£15.00
LerwickStandard Delivery4-5 Working Days£16.00
Isle of ManStandard Delivery 4-5 Working Days£13.00
Isle of WightStandard Delivery4-5 Working Days£13.00
Channel Islands Standard Delivery 4-5 Working Days£25.00
JerseyStandard Delivery 4-5 Working Days£13.00
GuernseyStandard Delivery 4-5 Working Days£15.00
Northern IrelandStandard Delivery4-5 Working Days£10.00
Republic of IrelandStandard Delivery 4-5 Working Days£10.00
BelgiumStandard Delivery 6-7 Working Days£15.00
NetherlandsStandard Delivery 6-7 Working Days£15.00
FranceStandard Delivery 6-7 Working Days£20.00
MonacoStandard Delivery 6-7 Working Days£15.00
DenmarkStandard Delivery 6-7 Working Days£15.00
GermanyStandard Delivery 6-7 Working Days£15.00
ItalyStandard Delivery 6-7 Working Days£20.00
SpainStandard Delivery 6-7 Working Days£20.00
PortugalStandard Delivery 6-7 Working Days£20.00
GreeceStandard Delivery 6-7 Working Days£25.00
AustriaStandard Delivery 6-7 Working Days£20.00
Czech RepublicStandard Delivery 6-7 Working Days£20.00
EstoniaStandard Delivery 6-7 Working Days£20.00
FinlandStandard Delivery 6-7 Working Days£20.00
HungaryStandard Delivery 6-7 Working Days£20.00
LatviaStandard Delivery 6-7 Working Days£20.00
LithuaniaStandard Delivery 6-7 Working Days£20.00
NorwayStandard Delivery 6-7 Working Days£25.00
PolandStandard Delivery 6-7 Working Days£15.00
San MarinoStandard Delivery 6-7 Working Days£20.00
SloveniaStandard Delivery 6-7 Working Days£20.00
SlovakiaStandard Delivery 6-7 Working Days£15.00
SwedenStandard Delivery 6-7 Working Days£20.00
SwitzerlandStandard Delivery 6-7 Working Days£20.00
BulgariaStandard Delivery 6-7 Working Days£25.00
CroatiaStandard Delivery 6-7 Working Days£25.00
RomaniaStandard Delivery 6-7 Working Days£25.00
TurkeyStandard Delivery 6-7 Working Days£25.00
LeichtensteinStandard Delivery 6-7 Working Days£25.00
AlbaniaStandard Delivery 6-7 Working Days£25.00
BelarusStandard Delivery 6-7 Working Days£25.00
BosniaStandard Delivery 6-7 Working Days£25.00
MoldovaStandard Delivery 6-7 Working Days£25.00
MontenegroStandard Delivery 6-7 Working Days£25.00
SerbiaStandard Delivery 6-7 Working Days£25.00
USAStandard Delivery 6-7 Working Days£25.00


Live outside of the UK, but still want Airsoft products? Don’t worry, we’ve got you covered. Unlike most international shipping we have you covered. When you place products into the Just BB Guns cart and select a country other than the UK (United Kingdom), we will calculate the shipping cost at that time. For more information about EU and international shipping, please contact us via our support team.


You can easily calculate your shipping costs via the table above on this page.


All prices are shown on this website, including UK VAT of 20%


If you enter a billing or shipping address outside of the UK our system will automatically remove the UK VAT. Please note, when you receive your order the local courier company will request local TAX and any import duty owed to be paid by you before they let you have the goods.


Please note that we will follow all the laws relative to your country, and if we cannot send out an item (such as an Airsoft Gun) we will contact you via email for more information and hold the items until we are contacted.

1 review for KA M4A1 Nylon Fiber Rifle with GHK GBB Kit

  1. 5 out of 5

    abduayoub (verified owner)

    So far so good, decent recoil for the gbb kit, shoots good. But I’d like to know how to remove the bolt carrier so I can use an AEG kit aswell, can’t find any information regarding this.

Add a review


Does this airsoft gun have gas with it?

No, our gas airsoft rifles do not come with gas. We recommend that you take a look at the gas we recommend on this product page or see our gas cans under the accessories tab at the top of the page.

Can I use other gas that is not designed for airsoft guns?

No, you must only use gas designed for airsoft or air guns. Yes, you will see videos on YouTube showing how to use other gas in your gun, but these have no lubricant and will damage your rifle beyond repair while voiding your warranty.

What BBs will work best in this airsoft gun?

BB pellets are, simply put, the ammo your airsoft rifle will use. Choosing the right BBs can be just as important as selecting the right gun. This is because BB weight matters - this is simply how heavy the BB is. 0.20g is the most common weight of BBs, but 0.25g may give better accuracy.

Do I have to buy a blue airsoft gun?

If you are asking this question, the answer is yes: you must buy a blue rifle. If you are a newcomer to airsoft and have not attended an airsoft club or site, you will not currently be registered with UKARA. If you are over 18, you can purchase an Airsoft Two-Tone rifle. These blue guns are UK legal and comply with the VCR Act of 2007.

How can I buy a black airsoft gun?

You must supply a defence at checkout to buy a RIF (Real Imitation Firearm) - a Black / Tan / Gold / Silver with no blue bits. Make sure one of the following is true: the delivery address is not in the UK, you have a current UKARA membership, you have a current UKAPA membership, you are a member of a properly insured historical re-enactment group or society, you are a film, television or theatre production company, you are (or are acting on behalf of) a museum, you are a Crown Servant in pursuance of your Crown duties.

What is FPS?

FPS means ‘feet per second’ - a measure of velocity or distance travelled in a given second. So, in theory, the higher the FPS, the further the BB pellet will travel. However, you will also need to consider BB pellet weight and, importantly, if you are using a Hop-Up unit.

What is a Hop-Up?

A Hop-Up makes it so that when a BB is fired from the airsoft gun, a small and grippy rubber pad rubs against the top of the BB. This has the effect of adding a backspin to the round projectile. Adding a backspin to any ball whilst flying through the air adds lift and therefore increases its range. Most high-end gas airsoft rifles have an adjustable hop-up so that you can set the gun for your optimal shooting distance.

Should I be worried about performance issues in cold weather?

Gas airsoft rifles perform best in warm weather conditions; however, if you plan on using this gas airsoft gun in cold weather, there are a few tricks worth keeping in mind. Also, please be aware there will always be a reduced performance in cold weather compared to a warm day. For more information, please see our blog.

Should I be worried about leaking magazines?

If not well looked after, gas magazines can develop leakages in the O ring seals. However, there are some simple steps you can follow to prevent this: never empty the gas from the magazine - only do so by firing the gun and NOT by pressing the valve button on the mag; always store away with a bit of gas in the magazine to stop the seals from drying out; use gas with a high silicon content, and from time to time, use a repair gas with a very high falcon content. Failing these steps, you can always replace the magazine with a new one or replace the valves and seals at fault - it's a simple and cheap job.

What warranty is supplied with this airsoft gun?

All of our airsoft guns and accessories have a manufacturer's warranty, and we offer a full refund or replacement for any issues a rifle may have due to the manufacturing process. This gun is not, however, covered for damage caused by dropping or misuse. The warranty is also not valid if the product has been altered or tampered with in any way, including being taken apart for any reason. Please see our Terms and Conditions on our website for full warranty information.

What should I do if I have an issue with this airsoft gun?

The first thing to do is to take a look at the manual supplied with the gun. Then, take a look at our blog. We offer many valuable tips and tricks to get the best from your rifle. Finally, if you still have problems, please contact our support team directly at sup[email protected] or join our live chat on our website.