Airsoft HOP-Up Chamber Units

If you need a replacement or upgrade for your standard HOP-up unit, the Specna Arms Magnus™ TDC Rotary Chamber is the perfect choice for you! This HOP unit is identical to the ones that come preinstalled in the Specna Arms PRIME series. That means it also includes the Helium™ Flat HOP rubber, which helps keep your BBs shooting straight.

The HOP-up unit is compatible with V2 gearboxes, meaning it will fit in almost all M4 or similar assault rifles. The chamber is made from high-density polymer and is an excellent solution if you are experiencing any HOP-related issues with your assault rifle.

If you are building out your M4/AR15 AEG for maximum performance the Gate EON HOP-up unit is probably already on your list! This precise HOP-up unit is constructed from CNC machined aluminium and is a rotary style unit which applies pressure directly to the top of the HOP-up rubber/nub to minimise side-to-side deviation.

This unit is compatible with M4/AR15 AEGs and can also be used with HPA setups thanks to the included nozzle sleeve which perfectly centres the nozzle for maximum efficiency.

If you are building out your M4/AR15 AEG for maximum performance the Gate EON HOP-up unit is probably already on your list! This precise HOP-up unit is constructed from CNC machined aluminium and is a rotary style unit which applies pressure directly to the top of the HOP-up rubber/nub to minimise side-to-side deviation.

This unit is compatible with M4/AR15 AEGs and can also be used with HPA setups thanks to the included nozzle sleeve which perfectly centres the nozzle for maximum efficiency.

If you are building out your M4/AR15 AEG for maximum performance the Gate EON HOP-up unit is probably already on your list! This precise HOP-up unit is constructed from CNC machined aluminium and is a rotary style unit which applies pressure directly to the top of the HOP-up rubber/nub to minimise side-to-side deviation.

This unit is compatible with M4/AR15 AEGs and can also be used with HPA setups thanks to the included nozzle sleeve which perfectly centres the nozzle for maximum efficiency.

Are you having HOP-up troubles with your M4 platforms? Delta Armory has you covered! This HOP-up chamber is a replacement part and comes with all the necessary pieces for installation, other than the HOP-up rubber and nub. The main chamber is made from a sturdy plastic polymer and is compatible with most M4-style AEGs which have V2 Gearboxes. It is an affordable solution to mend your platforms with damaged or old HOP-up chambers.

The Delta Armory HOP-up chamber is an affordable replacement for M4/AR-15 AEGs, fix up those old primaries and get them shooting again with this low-price solution.

If you need something new and better than your standard HOP-up unit, the Specna Arms Magnus™ TDC Rotary Chamber is the perfect choice for you! This HOP unit is identical to the ones that come preinstalled in the Specna Arms PRIME AK series. That means it also includes the Helium™ Flat HOP rubber, which helps keep your BBs shooting straight and further!

The HOP-up unit is compatible with V3 gearboxes and has a rotary adjustment system. Ensure it is compatible with your Airsoft replica before purchasing. The chamber is made from high-density polymer and is an excellent solution if you are experiencing any HOP-related issues with your assault rifle.

If you need better accuracy from your LCT AK AEG, this should do it! The LCT Rotary Hop Unit for AK AEG is designed for LCT AK replicas (LCK range) but may fit other brands, though we cannot guarantee off-brand compatibility currently.

This new HOP-up design brings the rotary adjuster style to the AK platform, offering reduced side-to-side shot deviation, improved setting retention, and finer adjustment increments. Like the original slider unit, this rotary accepts standard TM AEG spec HOP-up buckings, nubs and inner barrels.

If you need an affordable HOP chamber replacement, the Specna Arms Replacement Rotary HOP-Up Chamber is exactly what you need! This HOP-up chamber is a replacement part and comes with all the necessary pieces for installation, including the HOP-up rubber and nub. The main chamber is made from a sturdy plastic polymer and is compatible with all M4-style AEGs which have V2 Gearboxes. It is an affordable solution to mend your platforms with damaged or old HOP-up chambers.

The Specna Arms HOP-up chamber is a great fix for those old primaries sitting in the garage to get them shooting again.

Designed specifically for the Gate EON CNC Rotary HOP-up chamber, the Airtech Studios Full Upgrade Set for Gate EON HOP-up Chamber includes a TDC trolley, 2 x M-nubs and an inner barrel centring unit. This set is designed to convert the Gate EON into a true TDC unit, giving you more range and accuracy than ever before!

The benefits of a TDC HOP-up unit include a stronger HOP-up effect and less chance of side-to-side shot deviation when using heavy BBs at high FPS. This part will require a certain amount of expertise to install but thankfully, the process is fully explained on the Airtech Studios website. If you want to get the most out of your Gate EON HOP-up chamber, this kit will do the trick!

If you want glowing BBs without making your primary any longer, the CYMA Tracer HOP-Up Chamber for M4/AR-15 AEGs is a great shout! This alloy rotary HOP-up chamber integrates a tracer module, just like more expensive alternatives with the option to use red or green tracer BBs. The set includes everything you need to complete the HOP-up chamber build, including the bucking and nub.

This unit is powered by your AEG's battery through the balance cable, meaning it will only work with LiPo batteries unless you have something home-brewed in mind. The set includes 3 sets of wiring for use with 7.4V LiPo, 11.1V LiPo or custom battery solutions, all of which connect to the pre-wired connector on the HOP-up unit itself.

While it is designed for use with the CM.097 series and other CYMA Platinum M4/AR-15 AEGs, this unit should work with most M4/AR-15 AEGs on the market, potentially requiring modifications to fit certain brands. Depending on your specific platform, fitting may also require modification to your receiver. As such, we only recommend this unit for those who are comfortable working on AEG internals. If this sounds like you, why not shave off length and weight from your CQB primary with the CYMA Tracer HOP-Up Chamber for M4/AR-15 AEGs?

The ProWin CNC Aluminium HOP-Up Chamber for M4/AR15 AEG is a premium internal upgrade designed to improve air seal, consistency and long-term reliability for compatible rifles.

Constructed using precision CNC machining from aircraft-grade aluminium, this HOP-up unit offers significant durability and performance improvement over standard cast units. The rigid construction ensures stable alignment between the nozzle, bucking and barrel, resulting in improved compression and more consistent shot-to-shot performance. Its anodised surface finish adds corrosion resistance while reducing wear from repeated adjustments and maintenance.

Designed as a high-performance upgrade component, this chamber is ideal for players looking to enhance accuracy, efficiency and reliability in their M4 or AR15 platform AEG. Compatibility includes Tokyo Marui and most other standard-spec M4/M16 series Airsoft AEG rifles, making it a versatile choice for builders and techs alike.

If you're working on a beast of a sniper rifle, the Trusight TDC Conversion Kit for VSR-10 will get you there! This TDC HOP-up conversion set is a very impressive design, providing TDC functionality for reduced side-to-side deviation and a stronger HOP-up effect without requiring your outer barrel to be drilled!

That said, limited modifications to the TDC carrier are required due to purposely being made off-spec. This allows you to get the perfect fit for your specific HOP-up chamber by carefully filing it down with hand files. Installation instructions are available on the Trusight Website but for those who don't like reading, check out the installation video.

The main benefits of this set over other TDC kits are it doesn't require any permanent modifications to your original VSR-10 parts and you won't need to carry an Allen key in-game or ruin the looks of your VSR with a dial on the top of the barrel as you'll be using the original slider adjuster. Compatibility-wise, this set is designed specifically for the Tokyo Marui VSR-10 series but may also fit VSR-10 clones, though extra modification may be needed for a perfect fit.

If you want glowing BBs without making your primary any longer or fitting some bulky, slightly ugly, tracer unit, the CYMA Tracer HOP-Up Chamber for AK AEGs is a great choice! This alloy rotary HOP-up chamber integrates a tracer module, just like more expensive alternatives with the option to use red or green tracer BBs. The set includes everything you need to complete the HOP-up chamber build, including the bucking and nub.

This unit is powered by your AEG's battery through the balance cable, meaning it will only work with LiPo batteries unless you have something home-brewed in mind. The set includes 3 sets of wiring for use with 7.4V LiPo, 11.1V LiPo or custom battery solutions, all of which connect to the pre-wired connector on the HOP-up unit itself.

While it is designed for use with the CM series of AKs, this unit should work with most AKs on the market, however, potential modifications will be required to fit certain brands. Depending on your specific platform, fitting may also require modification to your receiver. As such, we only recommend this unit for those who are comfortable working on AEG internals. If this sounds like you, why not shave off length and weight from your classic Russian primary with the CYMA Tracer HOP-Up Chamber for AK AEGs!

If your inner barrel isn't sitting correctly in your HOP unit, a new C-Clip might be the cheap and easy solution! This polymer clip is compatible with M4 series HOP up chambers and inner barrels. It is constructed from black polymer and includes a steel spring.

If you're running one of the newer G&G platforms with the G&G rotary HOP-up, check this out! The Airtech Studios TDC Conversion Set for G&G Rotary HOP-up Unit is intended to provide maximum performance from your original G&G rotary HOP-up unit. Designed specifically for the latest G&G rotary HOP-up design, this kit includes an enhanced HOP-up arm, TDC trolley, 2 x M-nubs and a centring unit.

The benefits of a TDC HOP-up unit include a stronger HOP-up effect and less chance of side-to-side shot deviation when using heavy BBs at high FPS. This part will require modification to your original outer barrel to fit, but thankfully these mods are quite easy and thoroughly explained on the Airtech Studios website. If you want your G&G Rotary-equipped AEG to reach out and touch the enemy at crazy ranges, this TDC Conversion Set is what you need!

If you're after an affordable replacement HOP-up unit packed with perks, the KRYTAC Rotary HOP-Up Unit for M4/AR-15 AEGs is ideal. A rotary HOP-up unit which adjusts with tactile clicks, the KRYTAC unit is famed for its superb setting retention and superb quality. This is an original part from the Trident, REC7 and Trident LMG AEG builds, but should also fit most M4/AR-15 and AR-9 AEGs on the market.

Turn your stock ASG Scorpion EVO's HOP-up chamber to a TDC design without having to replace the whole unit. This kit includes everything you need to install the system into your current HOP-up chamber. It is compatible ONLY with ASG Scorpion EVOs and will not fit in any other HOP-up systems.

TDC (Top-Down-Centre) HOP units are incredibly sought after due to the increased friction they add to BBs, which increases the effectiveness of the HOP applied to your BBs. By installing TDC to the stock HOP-up you are guaranteed compatibility with the platform.

The set also includes rubber nubs, these ensure the HOP is stable while BBs accelerate through the unit, further improving the performance and consistency of your ASG Scorpion EVO. This is a very complex installation process and we only recommend it if you are confident in your understanding and ability to fit it to your HOP-up chamber.

If you're after a potent, innovative HOP-up system to top off your HPA build, the MechLabs ROTO Standard Bucking-Less HOP-up Chamber for HPA is a fantastic choice. An innovative new take on the HOP-up system, the ROTO uses a precision micro-injected nub built into the HOP-up arm, but eliminates the HOP-up bucking from the equation entirely.

This means no more replacing HOP-up buckings once they wear out, less hassle with installation and a far stronger, more precise HOP-up effect, especially when used with high-energy setups running heavy BBs. The rear collar of the unit is adjustable, allowing you to tune it to suit your nozzle length, though it does require a micro-adjustable nozzle, meaning it won't work with AEG builds.

Compatibility-wise, this is strictly for HPA setups and is ideally paired with a MechLabs HPA engine. Other compatible engines include PolarStar Jack, Kythera and F2, Wolverine Inferno Gen.2, Reaper and Hydra, and Gate PULSAR engines. These engines all require nozzle tuning either via the engine's adjustment or by adding shims for perfect feeding and air seal.

Using a MechLabs X-MOD, XX-MOD or NEXXUS engine with the ROTO allows you to take advantage of the ZERO Cap system, which means you can thread the HOP-up chamber into the front of the HPA engine to prevent alignment issues and maximise efficiency.

If you're working on the ultimate AK AEG build, the RetroArms Precision CNC HOP-Up Chamber for AK AEGs is an integral part! This CNC machined HOP-up unit is made from 7075 Aluminium, granting it steel-like strength and flawlessly precise machining with the weight reduction perks of aluminium.

The most unique aspect of this HOP-up unit is the inclusion of what RetroArms call the "collet nut", a threaded nut which seals the gap between the inner barrel and HOP-up chamber walls. This saves you any messing around with PTFE tape and ensures your platform's air-seal is perfect, resulting in more consistent FPS readings translating to improved accuracy downrange.

The set includes everything you'll need to complete the HOP-up unit with the exception of the bucking, nub and inner barrel but will require assembly. As such, we only recommend this HOP-up unit to those confident working on Airsoft internals. Best used with the RetroArms CNC Version 3 Gearbox but compatible with almost every TM-based AK AEG on the market, the RetroArms Precision CNC HOP-Up Chamber for AK AEGs is a fantastic upgrade option for performance-oriented AK build!

If you're working on an ultra-premium HPA build, the Mechlabs ROTO Pro CNC Bucking-Less HOP-up Chamber for HPA is an essential part! An innovative bucking-less design made entirely from CNC-machined aluminium, the ROTO Pro uses a precision micro-injected nub built into the HOP-up arm, eliminating the HOP-up bucking from the equation entirely.

This means no more replacing HOP-up buckings once they wear out, less hassle with installation and a far stronger, more precise HOP-up effect, especially when used with high-energy setups running heavy BBs. The rear collar of the unit is adjustable, allowing you to tune it to your nozzle length, though it requires a micro-adjustable nozzle, so it won't work with AEG builds.

The "Pro" version of the ROTO boasts a full CNC aluminium build, a more robust alternative to the ROTO Standard. The HOP-up dial is also enlarged to provide more precise dialling and more setting options, so you can tune to perfection.

Compatibility-wise, this is strictly for HPA setups and is ideally paired with a MechLabs HPA engine. Other compatible engines include PolarStar Jack, Kythera and F2, Wolverine Inferno Gen.2, Reaper and Hydra, and Gate PULSAR engines. These engines all require nozzle tuning either via the engine's adjustment or by adding shims for perfect feeding and air seal.

Using a MechLabs X-MOD, XX-MOD or NEXXUS engine with the ROTO allows you to take advantage of the ZERO Cap system, which means you can thread the HOP-up chamber into the front of the HPA engine to prevent alignment issues and maximise efficiency.

This is a high-quality upgrade that you need for your gas blowback rifle. The MAXX MODEL CNC Aluminium M4T HOP-up Chamber is constructed from the highest quality materials and has been machined precisely to guarantee you the best performance.

This HOP-up system will increase the precision of your MWS platform and may also increase FPS if installed correctly. Ensure that you are confident and know exactly what you are doing when installing. If you're unsure, get in touch with us!

If you're running an AK and seeking a robust HOP-up unit, the Specna Arms Alloy HOP-up Chamber for AK / SA-J Series AEGs is a fine choice. Made from strong alloy, this replacement original part is the external HOP-up chamber, and doesn't include internal or trim parts to complete the slider HOP-up unit.

Compatibility-wise, this part is ideal for Specna Arms SA-J series AK AEGs, but should also fit most other AK AEGs which use a slider-style HOP-up unit.

If you're running a TM M4 MWS/ZET system GBBR and need to improve accuracy, range and efficiency, the MAXX MODEL CNC Aluminium HOP-Up Chamber M4T for TM M4 MWS/ZET System GBBR is what you need. Made from CNC-machined aluminium and designed to work with the original TM adjuster unit, this set includes the choice of 3 HOP-up nubs and is compatible with any VSR/GBB spec HOP-up rubber. 

Being equipped with an innovative taper locking sleeve means there is absolutely no chance your inner barrel will rotate under the recoil of firing, and the included CNC aluminium locking C-clip keeps the barrel perfectly positioned laterally to ensure you get the best accuracy from your build. Assembly and installation will require a certain amount of expertise, but once inside your TM M4 MWS/ZET system or Double Eagle MWS clone, you'll never look back!

If you're fixing up your CORE™ Sniper Rifles, such as the SA-S02 or SA-S03, the Specna Arms Alloy HOP-up Chamber for SA-S0 Sniper Rifles is exactly what you need. Made from strong alloy, this replacement original part is the external HOP-up chamber, and doesn't include internal or trim parts to complete the slider HOP-up unit.

Compatibility-wise, this part is for Specna Arms CORE™ Sniper Rifles and is unlikely to be compatible with other sniper rifles.