PolarStar Airsoft

If you're planning the move over to HPA to take your build to the next level, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit is a great way to do it! A drop in cylinder replacement single-solenoid HPA conversion kit, the JACK™ is available to fit either version 2 (M4/AR-15) or version 3 (AK-47/74) gearboxes, including everything you need other than your airline, regulator, air bottle and FCU battery.

Capable of a stunning 30 rounds per second in most setups, with more air volume and a wider range of velocity adjustment than its rivals, the JACK™ is highly efficient with a stunning response rate and a vast range of programmable customisation options built into the included fire control unit (FCU). If you're a performance seeker, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit will change your game!

If you're planning the move over to HPA to take your build to the next level, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit is a great way to do it! A drop in cylinder replacement single-solenoid HPA conversion kit, the JACK™ is available to fit either version 2 (M4/AR-15) or version 3 (AK-47/74) gearboxes, including everything you need other than your airline, regulator, air bottle and FCU battery.

Capable of a stunning 30 rounds per second in most setups, with more air volume and a wider range of velocity adjustment than its rivals, the JACK™ is highly efficient with a stunning response rate and a vast range of programmable customisation options built into the included fire control unit (FCU). If you're a performance seeker, the PolarStar Airsoft JACK™ HPA Engine Conversion Kit will change your game!

These precision shim sets are designed to secure an HPA cylinder firmly within the gearbox shell, preventing unwanted forward or backward movement during operation. Small variations in gearbox pin diameter between manufacturers mean cylinder conversion kits must allow enough clearance to fit the largest pins, which can sometimes result in movement when installed in gearboxes with smaller pins.

If the cylinder can shift under use, nozzle alignment can change, affecting how consistently BBs are seated into the hop unit. This can lead to reduced air seal, inconsistent FPS, and overall performance loss. By correctly spacing the cylinder to match your gearbox pin size, these shims help maintain proper nozzle position and consistent air delivery.

Available in multiple thicknesses to suit the most common gearbox pin diameters, these shim sets allow a more precise and secure fit across a wide range of replicas. They are fully compatible with all PolarStar cylinder conversion systems, including F2, F1, JACK, and Kythera engines. Read the full description for size compatibility.

The Micro Reg™ GEN2 is a compact, high-performance HPA regulator designed for players who want a clean, low-profile setup without sacrificing consistency or air flow. Standing just over 2.25 inches tall, this regulator is smaller than a traditional UFA, allowing tanks to sit lower and fit more easily into compact hydration packs and minimalist loadouts.

Despite its reduced size, the Micro Reg™ GEN2 delivers a fast recharge rate comparable to larger regulators like the MRS™, ensuring stable output pressure even during rapid semi or full auto fire. Output pressure is adjustable from 40 to 130 PSI as standard, making it suitable for most HPA airsoft platforms. For higher-pressure applications, an optional high-pressure spring can be fitted to increase maximum output to approximately 200 PSI.

Internally, the GEN2 shares the same proven components as the UGS™ and CGS™ systems and uses just two O-rings across the entire assembly, improving reliability and reducing maintenance. A two-piece body design makes servicing easier, while the integral tournament lock allows the regulator to be secured with a standard zip tie for site compliance. The Micro Reg™ GEN2 is compatible with both standard HPA and SLP tanks and features dual 1/8 inch NPT outputs for flexible hose routing.

If you've accidentally dropped a screw on the carpet monster and can't seem to find it, you're in luck! The PolarStar Airsoft Kythera SA Complete Screw Kit is a comprehensive screw replacement kit, ensuring you have spares in case of future disasters. The screws are made from steel.

This screw set is for the Kythera SA HPA Engine and covers the V2, V2.5 and V3 variants.

This is a full O-ring replacement set for the centreline version of the PolarStar Airsoft F2™ HPA Engine Conversion Kit. If you want to make sure all the seals are up to par, this is a great way to refresh them on the cheap. It's also a great bit of kit to keep in your toolbox just in case of an emergency, or you accidentally lose an o-ring during installation or maintenance.

If you're after HPA performance with professional-level tuning options, the PolarStar Airsoft F2™ HPA Engine Conversion Kit is the way to go! An updated version of PolarStar's incredible Fusion™ engine, the F2™ is a dual-solenoid engine, allowing tuning of both the loading speed and air volume via the included digital FCU (fire control unit).

The set is designed to drop into either a V2 (M4/AR-15) or V3 (AK-47/74) gearbox (depending on the variant you choose), including everything you need other than your airline, regulator, air bottle and FCU battery.

Offering a variable rate of fire up to a stunning 30 rounds per second, adjustable velocity and a vast range of programmable options, including alternative fire modes, anti-stiction mode, "closed bolt" mode and "AEG" mode, the F2™ engine is the right choice for experienced HPA users looking to move up to a more complex, high-performance engine. If this sounds like you, the F2™ HPA Engine Conversion Kit belongs in your build!

The PolarStar Wire Harness is designed to provide reliable power delivery and long-term durability for PolarStar electro-pneumatic HPA systems. Constructed using 24 AWG wire, it offers strong electrical continuity to ensure consistent engine and FCU operation during use.

To protect the wiring as it passes through the replica’s body, the harness is wrapped in a nylon mesh sheath. This helps prevent abrasion and damage during installation or regular gameplay, particularly in tight gearbox and receiver spaces.

The harness is universally compatible with all PolarStar electro-pneumatic HPA systems that use a REV2 or REV3 FCU, excluding the original V2 GEN1 Fusion Engine and Amoeba kits. Multiple lengths are available to suit different gearbox types and installation layouts. Read the full description for the harness length guide.

The PolarStar Wire Harness is designed to provide reliable power delivery and long-term durability for PolarStar electro-pneumatic HPA systems. Constructed using 24 AWG wire, it offers strong electrical continuity to ensure consistent engine and FCU operation during use.

To protect the wiring as it passes through the replica’s body, the harness is wrapped in a nylon mesh sheath. This helps prevent abrasion and damage during installation or regular gameplay, particularly in tight gearbox and receiver spaces.

The harness is universally compatible with all PolarStar electro-pneumatic HPA systems that use a REV2 or REV3 FCU, excluding the original V2 GEN1 Fusion Engine and Amoeba kits. Multiple lengths are available to suit different gearbox types and installation layouts. Read the full description for the harness length guide.

The PolarStar Wire Harness is designed to provide reliable power delivery and long-term durability for PolarStar electro-pneumatic HPA systems. Constructed using 24 AWG wire, it offers strong electrical continuity to ensure consistent engine and FCU operation during use.

To protect the wiring as it passes through the replica’s body, the harness is wrapped in a nylon mesh sheath. This helps prevent abrasion and damage during installation or regular gameplay, particularly in tight gearbox and receiver spaces.

The harness is universally compatible with all PolarStar electro-pneumatic HPA systems that use a REV2 or REV3 FCU, excluding the original V2 GEN1 Fusion Engine and Amoeba kits. Multiple lengths are available to suit different gearbox types and installation layouts. Read the full description for the harness length guide.

The PolarStar Braided Air Line is a high-quality 36-inch HPA hose designed for reliable performance and unrestricted movement during play. It is made from flexible rubber and reinforced with a durable nylon braided outer sheath, which reduces the risk of kinking and twisting while allowing the line to move naturally with the player.

This air line is the standard hose supplied with PolarStar air rigs and is well-suited for most chest rig, belt, or backpack-mounted HPA tank setups. The braided construction adds additional strength without compromising flexibility and manoeuvrability, helping protect the line during aggressive/agile movement and long-term use.

It comes supplied with foster-style quick disconnect fittings pre-installed on the hose. The line is ready to integrate into most HPA systems. Please note that a separate male QD fitting for the engine or regulator may be required, depending on your setup.

This is a full O-ring replacement set for all versions of the PolarStar Airsoft Kythera™ SA Mechanical HPA Engine Conversion Kit. If you want to make sure all the seals are up to par, this is a great way to refresh them on the cheap. It's also a great bit of kit to keep in your toolbox just in case of an emergency or you accidentally lose an o-ring during installation or maintenance.

The PolarStar Universal Plugboard is used across the entire PolarStar HPA range, including Fusion Engine systems, and is standard equipment in MG series kits such as the M249. It provides a central connection point for solenoids, trigger inputs, and selector signals, making it a key component for both standard installs and custom wiring setups.

This plugboard is especially useful when a model-specific switchboard is not available, allowing flexible integration across a wide range of replicas. It supports clean and organised wiring while maintaining full compatibility with PolarStar electronic control systems.

The board features one 5-pin header for the main wiring harness and four clearly labelled 2-pin headers for individual system components. Each port is designated for a specific function to simplify installation and troubleshooting.

Whether you've damaged your Input Airline or you're working on some home-brew HPA madness, the PolarStar Airsoft HPA AirLine Input Tubing, 6mm; 12" Length will come in handy! This replacement original PolarStar part is a simple airline with a 6mm outer diameter and 4mm inner diameter, an ideal replacement for a damaged input line for PolarStar HPA engines.

This section of tubing measures approximately 12 inches (30cm) in length, just the right amount to run from the engine to the externals of your build. Please note, this set only includes the airline and doesn't come with hardware or fittings.

If you're running an older FCU and want to update, the PolarStar Fire Control Unit for HPA Engine; Rev 3.3 is a superb option. Compatible with the PolarStar JACK™, F1™, F2™, Fusion Engine™, this is the latest iteration of the PolarStar FCU.

This digital FCU can be programmed for various fire mode settings and tuning options, including burst modes, anti-stiction mode, rate of fire adjustment and semi-auto limiter, to name but a few. Programming is super easy thanks to the built-in LCD screen and joystick, allowing you to adjust on the fly in seconds, should the need arise. The tuning options available depend on the HPA engine that will be used; check the user manual for more information.

The FCU is pre-wired to a mini-JST connector and requires a battery to function. We recommend an ASG 7.4V 250mAh LiPo, although the size of the battery you choose depends on the available space on your donor platform.

This is a full O-ring replacement set for all versions of the PolarStar Airsoft JACK™ HPA Engine Conversion Kit, excluding the variant specifically for SMG-7 platforms (MP7 styled replicas). If you want to make sure all the seals are up to par, this is a great way to refresh them on the cheap. It's also a great bit of kit to keep in your toolbox just in case of an emergency or you accidentally lose an o-ring during installation or maintenance.

The PolarStar Filtered QD Fitting is designed to protect your HPA system from contamination, helping maintain consistent performance and long-term reliability. Filtering the air before it reaches your engine prevents dirt and debris from entering the system, where it could cause leaks, poor efficiency, or damage to internal components.

An integrated 80 micron filter element removes particles as small as 0.003 inches, roughly the diameter of a human hair. The conical filter design provides a larger surface area than traditional disc-style filters, allowing for strong airflow while still delivering effective filtration.

Manufactured from corrosion-resistant stainless steel, the QD fitting is built to withstand demanding environments and frequent use. It is compatible with industry-standard Foster 2 Series QD connectors, matching those used on PolarStar regulators and air lines.

Installation is quick and straightforward, with the fitting press fitting directly into standard 6mm nylon tubing used across PolarStar HPA systems. The filter element can be easily removed for cleaning and reused, and is fully replaceable if required.

If you're after a replacement switchboard for your PolarStar HPA setup, here it is! The PolarStar Airsoft Switchboard V2 for HPA Engine is a replacement original part for PolarStar HPA engines, compatible with the F1™, F2™ and JACK™ engines.

This switchboard is designed to replace the original trolley-type trigger switch in a traditional TM spec V2 gearbox. It is not compatible with variants of the V2 gearbox which use a snap-action/microswitch trigger, such as in the Ares V2 gearboxes.

This is a full O-ring replacement set for all versions of the PolarStar Airsoft Micro Regulator™. If you want to make sure all the seals are up to par, this is a great way to refresh them on the cheap. It's also a great bit of kit to keep in your toolbox just in case of an emergency, or you accidentally lose an o-ring during installation or maintenance.

If you need a new connection point for your hose line to plug into your HPA engine, you're in luck! The PolarStar Airsoft Input Fitting for Drop-In HPA Cylinder Kits is compatible with the PolarStar Airsoft F2™, F1™ and JACK™ drop-in cylinder kits. This connector creates a secure point for a QD air line to attach.

It has 1/4-28 threads and is not compatible with the PolarStar Airsoft Kythera™ SA Mechanical HPA Engine Conversion Kit. There is no input line installed on this fitting, so make sure you have the additional products before installation.

For PolarStar F2™ HPA engines, you need one of these PolarStar Airsoft F2Kythera Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar F2™ HPA engines, you need one of these PolarStar Airsoft F2Kythera Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar F2™ HPA engines, you need one of these PolarStar Airsoft F2Kythera Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar F2™ HPA engines, you need one of these PolarStar Airsoft F2Kythera Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar JACK™ HPA engines, you need one of these PolarStar Airsoft JACK™ Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar JACK™ HPA engines, you need one of these PolarStar Airsoft JACK™ Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

For PolarStar Kythera™ HPA engines, you need one of these PolarStar Airsoft Kythera™ Nozzles! They are sized using a numbered system rather than being labelled by rifle model. This is because nozzle length can vary between replicas of the same platform, depending on the manufacturer. Differences in gearbox shell thickness, hop unit positioning, or internal design can all affect how far the nozzle must reach to achieve a proper air seal.

To ensure the best possible compatibility, PolarStar produces a wide range of nozzle lengths. Each numbered nozzle corresponds to a specific overall length, and once you determine the correct number for your replica, that nozzle size is universal across all PolarStar HPA engines that use the numbered nozzle system. This means if your rifle requires a #1 nozzle, you will use a #1 nozzle regardless of whether you are installing an F2™, Jack™, or other compatible PolarStar engine. Some model-specific Kythera™ systems are excluded from this system.

Check out the "Full Description" for the replicas most commonly associated with the available nozzle sizes. These are guidelines only, as compatibility can extend beyond the models listed.

The PolarStar MP5K Gas Stock Adapter allows MP5K platforms to be configured with either a self-contained HPA or CO₂ stock, or a traditional buffer tube setup. It is fully compatible with the Elite Force MP5K with CYMA OEM internals and can also be fitted to Tokyo Marui MP5K models, with only minor receiver modification required on those platforms.

Featuring internal 1-3/16 inch by 16 threads, the adapter accepts both Type 1 and Type 2 UGS and CGS stocks, making it possible to build a compact, fully self-contained SMG setup without the need for a remote air line. Alternatively, it can be used to mount a standard Milspec buffer tube, allowing the replica to be run with a remote line or even as a standard AEG.

The adapter installs using the existing body pins and acts as a direct replacement for the original end plate, requiring no gearbox modification and ensuring compatibility across HPA and AEG builds. It is also designed to work with Milspec receiver end plates, allowing the use of a wide range of sling plates.

Machined from a solid block of 6061 aluminium and finished with a durable anodised coating, the adapter is built for long-term use. A built-in 10-32 set screw tightens against the underside of the buffer tube to prevent rotation, keeping the stock securely indexed and rock solid during play.

TechT Gun Sav Grease is the lubricant recommended by PolarStar for use across all of their HPA engines and regulators, and has been trusted exclusively for over a decade. Developed specifically for high-performance pneumatic systems, it delivers smooth, reliable operation without slowing internal components.

Unlike traditional airsoft greases designed for gears, which are often thick and heavy, Gun Sav is formulated to be exceptionally slick while maintaining stability across a wide range of conditions. It will not thicken in cold weather, become gummy in heat, or dry out during extended use, helping your HPA system maintain consistent performance throughout the year.

Correct lubrication is vital to the efficiency and reliability of any HPA setup. Gun Sav sticks extremely well to internal surfaces, meaning only a very small amount is required. With normal use, lubrication is typically only needed every 30,000 to 50,000 shots, making a single tub last for years even with regular play.

If you're a realism enjoyer becoming HPA-curious, this will convert you! The Kythera SA Mechanical HPA Engine Conversion Kit from PolarStar Airsoft is a mechanical HPA conversion kit for M4/AR-15 and AR-9 AEGs, designed as a drop-in replacement for the cylinder group of the version 2 gearbox.

Being a mechanical system means you don't need a battery, don't need to avoid rain and get to enjoy the feel of a trigger system designed to simulate real steel single-stage triggers, complete with an authentic, tactile break and reset. This variant of the Kythera is locked to semi-automatic fire only, making it ideal for those who prefer a precise double-tap to a burst.

While you don't get the programmable trigger and electronic tuning options of the JACK™ or F2™ engines, the Kythera SA is ideal for milsim skirmishers looking for a leap in performance, DMR builders seeking the easy route to a reliable high FPS build or CQB specialists seeking a realistic yet incredibly snappy trigger. If you seek next-level performance and realism in equal measure, the PolarStar Kythera SA belongs in your build!