• Detailed view of the custom hop-up window cut on the SPARK Hiei Kai 6.05mm tight bore stainless steel inner barrel optimized for Next-Gen MP5 and EVOLT electric guns.
  • An automated high-precision CNC Swiss lathe machine in Japan cutting and milling a stainless steel SPARK Hiei Kai inner barrel by da Vinci for AIRSOFT97.
1 2

SPARK (Airsoft97)

SPARK Hiei Kai 6.05mm Tight Bore High-Precision Inner Barrel for Next-Gen MP5/EVOLT (225mm) by AIRSOFT97

SPARK Hiei Kai 6.05mm Tight Bore High-Precision Inner Barrel for Next-Gen MP5/EVOLT (225mm) by AIRSOFT97

$89.99 USD
$89.99 USD
Sale Sold out
Taxes included. Shipping calculated at checkout.
The SPARK Hiei Kai 6.05mm Tight Bore Inner Barrel (225mm) delivers a premium mechanical upgrade engineered specifically for the short-carbine layout of next-generation electronic platforms. Developed through an exclusive manufacturing partnership between AIRSOFT97 and the master metalcraft technicians at da Vinci in Japan, this high-end barrel is meticulously shaped from domestic cold-forged stainless steel to maximize muzzle velocity and grouping precision.
This ultra-precise tight-bore component serves two crucial engineering purposes:
  1. Compression Optimization: The strict 6.05mm inner diameter creates a concentrated, high-efficiency pneumatic seal behind the BB, increasing overall muzzle velocity (FPS) on shorter setups without altering the main spring tension.
  2. Muzzle Gas Control: Incorporates a custom 20mm super-long internal taper at the muzzle tip, smoothing air pressure expansion as the projectile exits to prevent accuracy-destroying muzzle turbulence.

Technical Specifications:

  • Material: Highest grade domestic cold-forged SUS304 stainless steel
  • Bore Diameter: 6.05mm Tight Bore (Strict tolerance control via Japanese CNC milling)
  • Barrel Length: 225mm (Optimized short-carbine length)
  • Muzzle Design: 20mm Super-Long Air-Dissipation Taper
  • Package Contents: 1x SPARK Hiei Kai 6.05mm Tight Bore Inner Barrel (225mm)
  • Compatibility: Tokyo Marui Next-Generation Recoil Shock (NGRS) MP5 series, AIRSOFT97 EVOLT systems, and standard AEGs requiring a 225mm barrel profile
  • Origin: 100% Made in Japan
Tech & Safety Warning: Due to the high-precision 6.05mm tight-bore architecture, low-tier, out-of-round, or seamless-recycled BBs will cause immediate inner-barrel jamming and severe gear train/piston damage. Always pair this high-end barrel with premium, high-density precision BBs
View full details