• Close-up view of the precision-machined hop-up window and crown opening on the stainless steel SPARK Hiei Kai 6.15mm wide bore inner barrel by AIRSOFT97 against a black textured background.
  • A stacked row of multiple stainless steel SPARK Hiei Kai 6.15mm inner barrels by AIRSOFT97, displaying their precision hop-up cuts and engraved geometric alignment marks on a dark textured surface.
  • A precision CNC Swiss lathe machine in Japan cutting and milling the custom stainless steel hop-up window on a SPARK Hiei Kai inner barrel by da Vinci for AIRSOFT97.
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SPARK (Airsoft97)

SPARK Hiei Kai 6.15mm Wide Bore High-Precision Inner Barrel for Electric Guns

SPARK Hiei Kai 6.15mm Wide Bore High-Precision Inner Barrel for Electric Guns

$94.99 USD
$94.99 USD
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Inner Barrel Length
The SPARK Hiei Kai 6.15mm Wide Bore Series is the ultimate pinnacle of internal trajectory engineering, built to deliver unrivaled grouping accuracy and flat flight performance in custom AEGs. Developed through a collaboration between Airsoft97 and the master metalcraft artisans at da Vinci, these high-end barrels are meticulously crafted from the highest grade domestic cold-forged stainless steel.
The 6.15mm wide bore design creates an optimized cushion of pressurized air entirely surrounding the BB as it travels down the bore. This cushion isolates the projectile from the interior metal surfaces, virtually eliminating accuracy-killing barrel wall bounces while achieving the flat, long-distance trajectories unique to high-tier wide-bore builds.
This master craftsmanship series serves two crucial engineering purposes across its specific lengths:
  1. Muzzle Air Layer Management: Employs an ultra-long 20mm precision taper at the muzzle tip, smoothing air expansion behind the BB as it exits to eliminate destabilizing air turbulence.
  2. HOP Window Optimization: Features a custom-shaped, super-polished hop-up window to apply a perfectly square, friction-stabilized backspin on high-weight BBs (0.25g and heavier).

Technical Specifications:

  • Material: Highest grade domestic cold-forged SUS304 stainless steel
  • Bore Diameter: 6.15mm Wide Bore (Tolerance controlled via pure domestic CNC machining)
  • Muzzle Design: 20mm Super-Long Air-Cushion Taper
  • Variant Selection Profile:
    • 275mm: Optimized length pairing for short-carbines and CQB-length setups.
    • 300mm (Polished): Features a specialized interior mirror-polish finish tailored to minimize gas friction and maximize acoustic sound reduction.
    • 455mm: Full-length field barrel maximized for long outer barrel configurations (e.g., AK, M16, DMR setups) demanding extended flight lines.
  • Package Contents: 1x SPARK Hiei Kai 6.15mm Wide Bore Inner Barrel (of chosen length selection)
  • Compatibility: Standard Version 2/3 Tokyo Marui-specification AEG hop-up chambers
  • Origin: 100% Made in Japan
Tech & Safety Warning: Wide bore barrels purposefully vent excess cylinder air volume around the projectile to stabilize flight, which will introduce a minor drop in overall muzzle FPS. Ensure your internal gearbox air-volume parameters are matched with a premium cylinder setup to counteract potential under-volume power drop-off.
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