Product code: 6388
In Store
  • Radial Hop-Up Adjuster
  • CNC Machined Construction
  • Replacement Hop-Up Chamber

A replacement Rotary Adjustment type Hop-Up unit for V.2 Gearbox based Airsoft AEG M4 / M16 AEGs. Hop-Up units are designed to allow users adjust the amount of spin put on Airsoft BBs, changing the range and accuracy of their Airsoft gun. 

Full description


By using superior quality components, this Hop-Up Chamber allows users to get the best possible performance out of their Airsoft AEGs. The Hop-Up Chamber has been CNC Machined from Alloy, resulting in a tough and exquisitely finished component. Combined with the precision manufactured Hop-Up Arm and the Polymer Radial Adjustment Wheel, this Hop-Up can be finely tuned and adjusted, allowing users to improve the range and accuracy performance of their AEG M4s and M16s. As this Hop-Up is of the Radial Adjustment type, it is both incredibly simple to operate, and easy to use; the large, easy-access Radial wheel is possible to use even whilst Airsoft Skirmishing in gloves. Installation of the Hop-Up is easy; the quality of the components allows them to fit together with little difficulty. A horizontal indent on the rear of the C-Clip helps users install it the correct way around. Whether youre in search of components to tune up your AEG to enhance the range and accuracy; or simply seeking to swap out worn out or damaged parts with precision manufactured components.


  • Compatible with most Airsoft M4 AEG
  • Radial Hop-Up Unit
  • Precision CNC Machine Finish
  • Easy to Operate with Gloves on
  • Incredibly precise and fine Hop-Up adjustment
  • Very Limited horizontal Arm wobble, enhancing performance
  • Easy installation
  • Enhanced Accuracy and Range

Package Includes:

  • CNC M4 Hop-Up Chamber Gen2

Special Instruction:

Please Note that this Hop-Up Chamber is not supplied with the Washer required to maintain the position of Hop-Up Arm during use. We would recommend re-using the relevant Washer from your Airsoft Gun's original Hop-Up Unit. 

The C-Clip for the Hop-Up Unit is designed to fit in only one way around, to ease the installation of it. There is an indented horizontal line located at the top of the Clip; this must face Away from the Hop Up unit Chamber. 

The supplied O-Ring will not remain in place if simply rolled on; it must be stretched into position to stay in place. 

For further help or information please feel free to call our in-house Workshop Team on: 01484 644709



Internal Part Type
Hop-Up Unit


Item Colour
CNC Machined Alloy

Part Specific

Part for Power Source Type
Weapon Platform
M4 / AR15 / M16

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.