Cylinder & Cylinder Heads

The Cylinder and Cylinder Head together form the heart of every AEG’s compression system. With every shot, these components ensure that the air compressed by the piston is efficiently channelled towards the nozzle and ultimately the BB. A well-tuned compression system not only delivers better airtightness, but also ensures more consistent performance, a more stable firing pattern and a more reliable replica.

Go straight to the right information:
• Why choose high-quality cylinders and cylinder heads?
• What exactly does a cylinder do?
• Closed or ported cylinders?
• Cylinder heads: More than just a seal
• Cylinder heads with a damping pad
• Top brands in cylinders and cylinder heads
• Which cylinder and cylinder head do you need?
• Professional use
• What should you look out for when buying a Cylinder & Cylinder Head?
• Frequently asked questions about Cylinders & Cylinder Heads

In this category, you’ll find an extensive range of cylinders and cylinder heads from renowned brands such as Action Army, Guarder, Maxx Model, Point, Prometheus, Retro Arms and Specna Arms. Whether you’re looking to replace a worn-out part or carry out a complete gearbox upgrade, you’ll find the right components here for maintenance, repairs and performance-enhancing upgrades.

The range comprises closed cylinders, ported cylinders (also referred to as Type A, B or C, depending on the manufacturer) and cylinder heads for, amongst others, Version 2, Version 3, M4, AK and G36 gearboxes. In addition, cylinder heads are available with an integrated damping pad which helps to reduce the impact between the piston head and the cylinder head.

Why choose high-quality cylinders and cylinder heads?

A good compression system is not about achieving the highest possible air pressure, but about utilising the available air as efficiently as possible. The right combination of cylinder and cylinder head ensures that the air volume matches the length of the inner barrel and that the airtightness remains optimal throughout every firing cycle.

Choosing the right version not only contributes to more efficient compression, but also helps to minimise wear and tear and improve the replica’s long-term reliability.

What exactly does a Cylinder do?

The cylinder forms the chamber in which the air is compressed during each firing cycle. As soon as the piston moves forwards, pressure builds up in the cylinder and is channelled via the cylinder head and nozzle towards the hop-up system.

The cylinder head seals the front end of the cylinder and thus plays a key role in ensuring the airtightness of the entire compression system. Together with the piston head and the AEG nozzle, the cylinder head ensures that as little air as possible is lost before it reaches the BB.

That is precisely why, in a well-tuned compression system, the focus is not on a single component, but on the interaction between all compression components.

Locked or ported cylinders?

A common misconception is that a closed cylinder automatically delivers better performance. In reality, it is not about having as much air as possible, but about the right ratio between the available air volume and the length of the inner barrel.

Replicas with a longer inner barrel generally require a greater air volume than those with a short barrel. For this reason, in addition to fully sealed cylinders, there are also versions with one or more openings, known as ported cylinders. By reducing the cylinder volume, the compression is better suited to shorter barrels, allowing the system to operate more efficiently.

Manufacturers such as Maxx Model and Prometheus therefore often state on the packaging the inner barrel lengths for which a specific cylinder has been designed. This makes it easier to make the right choice and prevents you from fitting a cylinder that does not fit your replica perfectly.

When replacing or upgrading a cylinder, it is therefore advisable to consider not only the type of cylinder, but also the length of the inner barrel.

A correctly matched cylinder ultimately offers greater benefits than simply opting for a fully sealed version.

Cylinder Heads: more than just a cover

Whilst the cylinder is responsible for building up air pressure, the cylinder head ensures that this pressure is efficiently channelled towards the nozzle. At the same time, the cylinder head forms a key part of the air seal within the compression system. A good fit between the cylinder, cylinder head, piston head and nozzle is essential to prevent air leakage and to keep the replica’s performance as consistent as possible.

Cylinder heads are available for various gearbox configurations, including Version 2, Version 3, M4, AK and G36 replicas. You should therefore always check that the cylinder head you have chosen is compatible with your gearbox before replacing a part or carrying out an upgrade.

Cylinder heads with a damping pad

Many high-quality cylinder heads are fitted with a rubber damping pad at the front. This absorbs the impact when the piston head strikes the cylinder head at the end of the power stroke.

There are two advantages to this. On the one hand, it reduces the impact between the two components, thereby reducing the strain on the gearbox. On the other hand, the damping pad helps to slightly reduce the mechanical noise from the gearbox, which can be a welcome bonus, particularly in high-performance builds.

Although a damping pad does not directly affect the FPS or accuracy, it does contribute to smoother operation and can help to extend the lifespan of internal components.

Leading brands in Cylinders & Cylinder Heads

In this category, you will find a carefully selected range of products from manufacturers renowned for their quality, dimensional stability and reliable performance.

Maxx Model and Retro Arms are among the very best when it comes to CNC-machined upgrade parts and are widely used in high-end gearbox builds.

Prometheus is renowned for its high-quality compression parts and, for many cylinders, clearly states the inner barrel lengths for which they have been designed. Maxx Model also provides this information, making it easier for you to choose the right cylinder for your replica.

You’ll also find high-quality parts from Guarder, Action Army, Point and Specna Arms, which are suitable for both maintenance and performance-enhancing upgrades.

Which cylinder and cylinder head do you need?

The right choice depends on the configuration of your replica and the purpose of the upgrade. A worn cylinder head requires a different solution to a complete gearbox rebuild, which also involves adjusting the stroke length.

You should therefore not just look at the material or the manufacturer, but above all at the combination of components within the compression system. A well-chosen cylinder and cylinder head are designed to match the length of the inner barrel, the piston head and the nozzle, enabling all components to work together optimally.

Practical tip

Are you replacing the cylinder or cylinder head as part of a gearbox upgrade? If so, be sure to check the condition of the piston and piston head, the O-rings and the AEG nozzle at the same time. A good compression system will only perform optimally when all components are correctly matched. A new cylinder will not compensate for a worn piston head or a leaking nozzle.

Professional use

A reliable compression system forms the basis of every high-performance AEG. That is why, when overhauling a gearbox, experienced airsoft technicians pay close attention to the condition of the cylinder and cylinder head. It is not only the airtightness that is important here, but also the correct match between the air volume and the length of the inner barrel.

During maintenance, therefore, checks are carried out not only to see whether the cylinder or cylinder head shows signs of wear, but also to ensure that the O-rings are still sealing properly and that the other compression components are working together correctly. Even a small leak within the compression system can lead to fluctuating FPS values and a less consistent shot pattern.

Even when carrying out performance-oriented upgrades, experienced mechanics do not automatically opt for a sealed cylinder or the most expensive parts. They carefully tune the entire compression system to the replica’s configuration, so that all components work together optimally. It is precisely this attention to detail that ultimately results in a reliable replica with predictable performance.

What should you look out for when buying a cylinder and cylinder head?

Before you buy a cylinder or cylinder head, it is a good idea to first decide what you want to achieve. Are you replacing a worn part, fixing an air seal problem, or rebuilding a complete gearbox?

In this regard, please bear in mind, amongst other things:

• The length of the inner barrel.
• Locked or ported cylinder.
• Compatibility with your gearbox (V2, V3, M4, AK or G36).
• The quality of the air seals and O-rings.
• The connection to the piston head and nozzle.
• The inclusion of a damping pad is essential if you want to minimise wear and noise.

By checking the entire compression system beforehand, you can avoid replacing parts that may not fit together properly in the end.

Cylinders and cylinder heads within the compression system

The cylinder and cylinder head together form a key component of an AEG’s complete compression system. Only when these parts work effectively in conjunction with the piston head, nozzle and other compression components can an efficient air seal and consistent firing performance be achieved.

Are you carrying out maintenance or a complete gearbox upgrade? If so, be sure to check out our AEG Compression Parts category, where you’ll find all the parts you need to optimally coordinate your compression system.

Common mistakes

As the cylinder and cylinder head form part of a larger compression system, problems are often misdiagnosed. As a result, parts are replaced that are actually still working perfectly well, whilst the real cause lies elsewhere.

Common mistakes include:

• Believing that a closed-cylinder engine always performs better than a ported version.
• Do not take the length of the inner barrel into account when choosing a new cylinder.
• Replacing the cylinder without also checking the condition of the cylinder head, piston head and nozzle.
• Reusing old or damaged O-rings, which ultimately compromises the airtight seal.
• Choosing the wrong cylinder head for the gearbox type or replica.
• Expecting a new cylinder to automatically deliver a higher FPS, whilst the compression system as a whole does not seal properly.

By checking the entire compression system rather than simply replacing a single component, you can avoid many unnecessary problems and get more out of every upgrade.

Frequently Asked Questions about Cylinders & Cylinder Heads

What is the difference between a closed cylinder and a ported cylinder?
A closed cylinder has the maximum air volume and is generally used in replicas with longer inner barrels. A ported cylinder has one or more openings, which allows the air volume to be adjusted to suit shorter barrels. Which version is most suitable depends on the combination of cylinder and inner barrel.

Why do manufacturers such as Maxx Model and Prometheus specify a recommended inner barrel length?
Because the air volume in the cylinder must correspond to the length of the inner barrel. By following these recommendations, you ensure that the compression system operates as efficiently as possible and prevent unnecessary air loss or less efficient compression.

Does a closed cylinder always result in a higher FPS?
No. A closed cylinder is not automatically an upgrade. If the air volume is not properly matched to the length of the inner barrel, this can actually result in a less efficient compression system. The right balance is more important than having the largest possible air volume.

What is the advantage of a cylinder head with a damping pad?
A cylinder head with an integrated damping pad reduces the impact between the piston head and the cylinder head. This minimises vibrations and mechanical noise and reduces the load on the internal components.

Do I need to replace the cylinder head when fitting a new cylinder?
Not always. If the existing cylinder head is still in good condition and seals properly, it can often simply be reused. However, always check the condition of the O-rings and how well they fit with the other compression components before closing the gearbox again.

Advice from Airsoft-Legends

Replacing a cylinder or cylinder head may seem like a simple upgrade, but the greatest improvement almost always comes from correctly tuning the entire compression system. Therefore, don’t just look at the material or the brand, but focus above all on the combination of the inner barrel, cylinder, cylinder head, piston head and AEG nozzle.

Are you unsure which cylinder is best suited to your replica? Don’t automatically opt for a closed version; instead, check which configuration best matches the length of your inner barrel. Manufacturers such as Maxx Model and Prometheus provide clear guidelines on their packaging, enabling you to make an informed choice.

High-quality cylinders and cylinder heads form the basis of an efficient and reliable compression system. Discover our range from Action Army, Guarder, Maxx Model, Point, Prometheus, Retro Arms and Specna Arms, and ensure a perfect balance between airtightness, durability and consistent performance.