The ultimate inner barrel that delivers performance that satisfies SPARK custom engineers.
The bore has been widened from the previous 6.05mm bore diameter to 6.15mm, resulting in the Hirei® Kai.
"Hirei®" is a high-quality, ultra-precise inner barrel made entirely in Japan, developed with the cutting-edge metalworking techniques of the craftsmen at "da Vinci," the manufacturer of the custom barrel "Guren/Raizen" series, and the SPARK concept. Further refinements have been made in various areas to create the ultimate inner barrel, "Hirei® 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 extraordinary long taper streamlines the air layer surrounding the BB bullet, improving accuracy and distance.
The inner diameter of 6.15mm was derived from the results of various experiments.
The ideal inner diameter is 6.15mm, which achieves the long trajectory that is unique to a wide bore while minimizing the disadvantage of power loss.
The Wide Bore Hiei® Kai consistently achieves a flat trajectory even with a variety of settings, making it an extremely easy-to-use inner barrel for tuning.
It is especially compatible with tuning using BB bullets of 0.25g or more.
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.
[Lineup]
(Marui standard electric gun)
180 mm
208 mm
229 mm
247 mm
275 mm
300 mm
The inner barrel cannot be cut due to its special taper.
If you would like a Tokyo Marui M14 version, please contact us separately.
[ 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.
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.
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.
[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 product may be delivered in a modified or repackaged original box due to missing or damaged packaging.
- 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.
