The ultimate inner barrel that delivers performance that satisfies SPARK custom engineers.
To achieve stable trajectory and accuracy, the da Vinci craftsmen, who created the custom barrels "Guren/Raizen" series, used their cutting-edge metalworking techniques and the SPARK concept to develop the high-quality, ultra-precise inner barrel "Hiei®". Further refinements were made in various areas to create the ultimate inner barrel, "Hiei® Kai".
The material used is the highest quality domestically produced stainless steel, produced by cold forging, and is also manufactured using precision machining using domestically produced high-precision CNC machines.
To ensure a stable hop-up effect, we paid particular attention to the shape and polishing of the hop-up window, and the end of the barrel has an ultra-long 20mm taper that is designed to create a layer of air that envelops the BB bullets!
The extraordinarily long taper streamlines the air layer surrounding the BB bullets, and in combination with the tight 6.05 mm diameter, it achieves improved initial velocity, accuracy, and distance.
This Tokyo Marui gas blowback rifle uses an "Accuracy Bridge," a bridge structure that is different from genuine or general-purpose products, in order to pursue a stable HOP.
To prevent possible collisions with the loading nozzle, no expense has been spared, with expertly crafted tapered processing also being applied to the inner walls.
This is a high-quality, domestically produced product that incorporates the best of Japanese technology and is recommended for those seeking a higher level of accuracy.
"Hiei" is a registered trademark of SPARK, an inner barrel for airsoft guns.
*Due to the special taper, the inner barrel cannot be cut.
*Power will vary depending on the assembly. Please be sure to adjust the power yourself, especially with heavy bullets, to ensure that the legal limit (less than 0.989 J / 35°C) is not exceeded.
*Aftermarket gaskets are not recommended as they are prone to causing interference with the bridge.
[Size lineup]
180mm / 210mm / 250mm
Tokyo Marui: MP7 / M4 / AKM / Type 89 GBBR compatible shape.
VFC: MCMR etc. *The position of the fixing groove for VFC varies depending on the lot, so please refer to the product image.
*Not compatible with HK416A5 V3.
When combined with our "Neko Nade HOP" part, it produces the best results, especially in the 250 mm size.
When installing the Neko Nade HOP into the chamber of a Marui M4 series gas blowback gun, please cut both ends so that the front-to-back length is approximately 4.3 mm.
Nekonade HOP cannot be used with genuine MP7, AKM, Type 89, or VFC.
The inner barrel cannot be cut due to its special taper.
The power will change depending on the assembly. Please be sure to adjust it yourself carefully, especially with heavy bullets, to ensure that the legal limit (less than 0.989 J / 35°C) is not exceeded.
Installation guidelines
- 180 mm: For M4 short barrel custom.
- 210 mm: For genuine MWS, meets legal muzzle velocity.
(Confirmed in June 2022 batch)
- 250 mm: NPAS adjustment required, emphasis on accuracy.
Even if the length is stated to be within the legal muzzle velocity, the power will change depending on the part settings and individual differences, so please be sure to inspect and customize it within the legal muzzle velocity at your own responsibility.
When installing it on an AKM straight out of the box, we recommend using a 250mm + SPARK custom valve.
If it is 180 mm, it will meet the legal muzzle velocity with the original assembly, but it will not be as effective as it could be.
It was developed with the assumption that it would be used in combination with Marui's genuine gasket, and when used in conjunction with the "SPARK Neko Nade HOP" it demonstrates the accuracy shown in the reference video.
In the case of AKM, the same performance can be achieved with the original gasket x 250 mm x low power valve.
In the case of VFC, please adjust the gasket, initial velocity, etc. yourself.
[ Features of Hirei® Kai ]
- Super polished HOP window
A stable hop-up is important for a stable trajectory.
The interior walls, including the area around the HOP window, are thoroughly polished by craftsmen to eliminate any uncertainties that may affect the BB bullets.
The HOP window is subjected to a "round cutting process" which is extremely difficult to process, which allows the HOP packing to move smoothly and maximizes its performance.
Due to its extremely hard nature, cold-forged stainless steel is extremely difficult to machine, requiring highly precise CNC machines, skilled craftsmen to select cutting teeth, and meticulous machining programming. The exceptionally long taper of 20 mm suppresses sudden changes in resistance around the barrel exit and increases in turbulence coefficient, eliminating the negative effects on accuracy. This maximizes the gun's inherent accuracy.
It is easy to describe the precise round cutting of the HOP window, the polishing of the inner surface of the barrel, and the long taper processing of the muzzle side, but creating an ultra-precise inner barrel using cold-forged stainless steel, which is difficult to process, requires a high level of technical skill.
"Hirei® Kai" is a MADE IN JAPAN product that Japan is proud of around the world.
In standard GBB inner barrels, the part that comes into contact with the hop-up gun packing is generally designed with a recessed top surface to avoid collision with the loading nozzle, but this causes instability in the hop-up. The Hirei® Kai uses a bridge structure, like an electric gun, to stabilize the movement of the hop-up gun packing and achieve a more uniform hop-up.
Of course, to prevent collision with the loading nozzle, the part where the nozzle enters is finished with a tapered finish by skilled artisans, resulting in a level of meticulous quality that cannot be replicated by machine finishing.
[Notes]
- This product is intended for ages 18 and over, and cannot be purchased by anyone under the age of 18.
- Even if the product is new, there may be scratches on the product itself or its accessories from the time of shipping. Even if the product is the same, there may be differences in color between individual products, but these are all within the product specifications.
- The external specifications and accessory configuration may change without notice. In addition, the original box may be modified or repackaged if the packaging is missing or damaged.
- When installing, please be careful not to violate the legal power by using a muzzle velocity meter or similar device.
- Processing and adjustment may be required for installation.
- The product description does not guarantee improved performance.
