Product code:
In Store
  • Very Gas Efficient
  • G5 Style Magazine
  • KeyMod Rail

Currently the front runner in quality, reliability and realism when it comes the M4 gas blow back platform. Building from the already brilliant G5 and GHK M4 carbine, and GHK have added a number of improvements.

Full description


Upgrades include a new hop unit to increase accuracy and BB flight by giving more consistent pressure on the BB and less likely to move. A Further upgrade is the new strengthened steel bolt carrier giving better recoil and more longevity to the internals of the weapon. The New KeyMod rail system fitted to this M4 is expertly made from CNC'd aluminium and the keymod allows you to add the rail sections only to where an accessory is mounted this also means the profile of the rail drops from 50mm to 35mm making extended holding easier for long operations, its anodised coating will make it a very durable for skirmishers that like to play hard fast and aggressive and expect the odd knock and bump on their RIF. Other external features of the Rifle is the light weight aluminium receiver that incorporates the US navy seal markings deep engraved and highly detailed, the included flash hider will also accept QD suppressors. The GBB is for collectors and skirmishers look for the absolute best in terms of build quality, reliability and also efficiency with the new upgraded internals and the G5 polymer magazine you will be hard pushed to find a better gas RIF

Other Features:

  • 6.03 Tightbore Barrel
  • Steel Internals
  • Three Prong Flash Hider capable of Accepting QD Suppressors
  • US Navy Seal Engraved Markings
  • GHK MOD1 KeyMod Rail
  • 4 Position LE Stock
  • New Upgraded GHK Hop-Unit
  • New Steel Bolt

MOD1, 9.5'' Variant Features:

  • 9.5'' RIS Rail
  • 10'' Outer Barrel

MOD2, 14.5 Variant Features:

  • 14.5'' RIS Rail
  • 14'' Outer Barrel

Package Includes:

  • M4 KeyMod GBBR Airsoft Rifle

Special Instructions:

Please note that to put the weapon into SAFE the weapon must be cocked

We recommend that after every game you fully maintain your GHK M4 after every game to ensure that your rifle fires perfectly first time, every time. This includes a full strip down and re-lubrication.

This Weapon Includes A G5 Magazine but others GHK magazines will also function in the weapon



Weapon Type
Assault Rifle
Over 18
Defence / UKARA Required
Yes, No,
FPS (Feet Per Second)
380fps, using 0.20g BB
Site Legal
Included Items
  • Magazine
  • Instruction Manual
Skill Level
Experienced Player


Primary Colour
Full Alloy Construction
External Construction
Internal Construction
Polymer , Alloy ,

Weapon Specific

Powered By
Green Gas
Gas Blowback
Weapon Platform
M4 / AR15 / M16
Magazine Style
Fire Selector
Semi Automatic
Full Automatic
Safety Features
Trigger Lock
Shooter Configuration
Right Handed
Weapon Configuration
Weapon Scale
Suggested BB Weight


Hop-Up Unit
Hop-Up Adjuster
Hop-Up Location
Adjustable in front of the Barrel Nut when lower Handguard Section Removed


  • Railed Handguard
  • AR Buffer Tube
  • KeyMod Handguard
  • Railed Reciever
Rail System
20mm RIS / RAS , KeyMod ,
Stock Setting
Stock Positions
4 Position
Sight Type
Sling Options
Stock , QD , Loop ,


Outer Barrel Thread Type
Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
Inner Barrel Diameter

Magazine Specific

Magazine Type
Low Capacity , Spring Loaded, Gas,
Magazine BB Capacity
Approx. 38 Rounds
Magazine BB Fill Method
Speed Loader
Magazine BB Fill Location
Magazine Gas Fill Location
Magazine Gas Type
Green Gas

Gas Gun Specific

Gas Compatability
Green Gas, Red Gas,
Gas Recommendation
Green Gas

Product Testing Data

Test Description
Using 0.20g BB, @ 14.6°c
Tested Using
WE High Performance Green Gas 300g
Test Date

Delivery & returns


1 - Deliveries
2 - Returns

1 - Deliveries

We are proud of our rapid delivery which, comprises of Royal Mail 1nd class recorded and courrier next working day to mainland UK. We also ship to EU countries; Scottish Highlands and Islands which are a minimum of a two day service and are shipped by land / sea. Our deliveries are made by DPD and Royal Mail recorded 1st or 2nd class signed for, and Royal Mail Standard.

We deliver from Monday to Friday, and Saturday with a special service. If more than 7 days have passed since we confirmed dispatch and your order has not arrived, then please call our Customer Care team on 01484 644709. If we don’t have stock of an item then we will call and email you letting you know that it is out of stock, and we will send it to you as soon as stock becomes available. If you want to cancel any item/s that are out of stock once order you can. For most UK deliveries postage & packing is based upon the value, size and weight of your order.

We always look to fulfil every order in full on time, but on the odd occasion an  item is missing we will attempt to contact you prior to shipping. If your order is a Next Day service, and we cannot contact you, we will refund the missing item(s), and ship the rest of the order immediately.

Upon signing for the delivery you are accepting the correct delivery for your items, however, we do understand that you might not be able to open your package straight away so you have up to 48 Hours to advise us of missing / incorrect items.

Please note we do not compensate in any way for time spent waiting in for deliveries that do not arrive, we do however accept that in life, mistakes and circumstances happen that can unfortunately mean that your item may not be delivered next day as requested e.g. bad weather, computer error etc. If such mistakes do occur we will refund your postage charge in full and by agreeing to the previous sentence and proceeding with the order you accept that we have done everything we can to help you obtain the package.

For orders outside of the UK Mainland please specify your location when calculating postage. 

For all international orders there may be an additional postage charge on top of that quoted. You will be contacted if this applies for your order. If the postage costs are too high, you may cancel your order at any time prior to dispatch.

For more information relating to Deliveries please see our Delivery Information.

2 - Returns

You can cancel any order that has not been dispatched. Please call our Customer Care team on 01484 644709 between 9:30am and 5:00pm or log onto the website and check the status of your order in your account.

If you do want to arrange the return of an item, simply call our friendly Customer Care team on 01484 644709 from 9:30am to 5:00pm and they will explain how to return the items.

Alternatively you can get in touch with us via our Contact Us Page.

If you are returning a product because it is faulty or something is wrong then we will pay for it to be returned to us. The Customer Care Team will arrange for cost you incur to be refunded.

Any none faulty return must be shipped back in full re-saleable order with original undamaged packaging.

You can return any item for any reason whatsoever, even if you have just changed your mind, within 14 days of receipt of the order. This is in addition to your rights under the Consumer Protection (Distance Selling) Regulations 2000.
We want you to be absolutely happy with our products and services, so we provide the simple Patrol Base guarantee:  if on receiving your item you are unhappy with your item for any reason then simply send it back to us. We will replace or refund the item.

This guarantee ensures that if you are unsure about what you are purchasing you have the peace of mind of knowing that we are here to help. In addition, if you decide that you made a mistake or you change your mind then please send the goods back within 14 days of receipt. Sadly, this can only apply to standard range products; we cannot accept back any item that has been made to order i.e. Two Tone Airsoft equipment.

Upon signing for the delivery you are accepting the correct delivery for your items, however, we do understand that you might not be able to open your package straight away so you have up to 48 Hours to advise us of missing / incorrect items.
If you do decide to return anything for whatever reason then please get in touch with us via our Contact Us Page for a copy of our returns form.

If you do send goods back for any reason other than a fault you will normally be asked to pay the carriage charges, we would just have to recover the costs in our prices. We would rather be completely straight with you, keep our prices as low as possible, and just ask you to pay if you choose to return anything.

For more information relating to returns please see our Returns Policy Page.

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