[SPARK] Hiei Kai 6.05 - Jet Black - MWS 250mm 1000th Anniversary Limited Edition

1,000-piece commemorative limited edition model

The Hiei Kai - Jet Black - commemorates the sale of 1,000 units of the Hiei Kai MWS 250mm.

The beautiful, jet-black coating is extremely thin and extremely hard, making it a special piece worthy of a limited edition.

[ About Hiei Kai ]

• "Hiei® Kai" is a top-of-the-line, domestically produced inner barrel developed by da Vinci's craftsmen using cutting-edge metal processing technology and the SPARK concept to achieve stable trajectory and accuracy.
  
  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 encase the BBs in a layer of air!
  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.

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  When combined with SPARK's "Neko Nade HOP" part, it provides the highest accuracy.
  
  When using the Neko Nade HOP with a Marui M4 series gas blowback gun, please trim both ends to a length of approximately 4.3 mm. (The Neko Nade HOP cannot be used with genuine MP7, AKM, Type 89, or VFC guns.)

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  Installation guidelines
  
  When installing a 250mm Hiei Kai rifle in a Marui MWS or AK series rifle, it is necessary to adjust the power using an NPAS or low power valve.
  
  The power will change depending on the settings of other parts and individual differences, so please be sure to inspect and customize within the legal muzzle velocity at your own responsibility.
  
  
  *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 HOP type gaskets may interfere with the bridge, so please make sure to check that there is no interference.
  *Frequent cleaning is recommended to maintain performance.
  *The inner barrel for airsoft guns, "Hiei," is a registered trademark of SPARK Ltd.

[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.

20 mm ultra-long taper

• Extremely hard cold-forged stainless steel is extremely difficult to process due to its hardness, and requires high-precision CNC machines, skilled craftsmen to select cutting teeth, and precise machining programming. The extraordinary 20 mm ultra-long taper suppresses sudden changes in resistance around the barrel exit and increases in turbulence coefficient, eliminating the negative impact on accuracy.
• This maximizes the gun's inherent accuracy.

Proudly made in Japan

• 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.

Accuracy bridge shape

• 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 for advanced users. Installation requires knowledge and skills of airsoft guns.
• 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.