- Rotary dial for precise hop adjustment
- Durable metal alloy construction
- Drop-in original replacement design
The CYMA Rotary HOP-Up Chamber for M4/AR-15 AEGs is a solid upgrade or replacement choice for players looking to restore air seal consistency and shot stability. Built from durable metal alloy, it offers improved longevity over standard polymer units while maintaining reliable performance across a wide range of builds.
Designed as an original replacement part, this rotary hop-up unit installs with little to no modification in most compatible M4 and AR-15 AEG platforms. The rotary adjustment system allows for finer tuning than traditional slider styles, making it ideal for players who want consistent BB lift and predictable accuracy.
Fast Delivery
Delivery & Postage
Here at Patrol Base, we send all our packages from our Warehouse based in the UK with the exception of European Warehouse Items. All of our parcels are sent with specially picked couriers to ensure your parcels get to you on time and in one piece.
For more information please check out our Delivery Information Page.
Estimates
Below are some rough postage prices for orders. Please note these are subject to change and are only a rough guide. For a more accurate postage estimate please use the Postage Calculator at the basket.
UK 3-5 day Standard
£6.95
From
Dispatched with 24hr UK mainland
£8.95
From
Highlands / Islands
£24.99*
From
* Please note that Scottish Highlands, and Islands postage prices can vary wildly. Please refer to the Postage Calculator at the basket for the lowest possible price.
Returns
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.
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.
For more information on returning products, and how to do it please visit our Returns Policy Page.
Description
Features
- Metal alloy construction
- Rotary adjustment dial
- Complete hop-up unit
- Drop-in installation
- OEM replacement part
- Compatible with M4/AR-15 AEG platforms
Package Includes
- CYMA Rotary HOP-Up Chamber for M4/AR-15 AEGs
Specification
General
Parts & Accessories Type | Electric Internal Parts, Hop-Up Units and Buckings, |
|---|---|
Internal Part Type | Hop-Up & Parts, Hop-Up Unit, |
 | |
Construction
Internal Part Construction | Polymer, Alloy, Rubber, |
|---|
Part Specific
Part for Power Source Type | Electric |
|---|---|
 | Assault Rifle |
Size guide
Parts Fitting
Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff.
Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.
We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!
Unique Parts
Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.
Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.
If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.
For more information with fitting parts, or should you require help, feel free to get in touch with our Workshop Department via our Contact Us Page.
Terms and Conditions relating to parts fitting can be read on our Terms and Conditions Page.