{"product_id":"spark-hiei-05-nme-229","title":"【SPARK】Hiei-kai for Next-Gen MP5\/EVOLT 229mm Inner Barrel, 6.05mm Inner Diameter","description":"\u003cdiv class=\"ec-productRole__description\"\u003e\n\n\u003cdiv class=\"cp_box\"\u003e\n\n\u003cdiv class=\"cp_container\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe ultimate inner barrel, achieving performance that satisfies SPARK custom engineers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe \"Hiei®\", a purely domestic, high-quality, ultra-precise inner barrel, was developed using the cutting-edge metal processing technology of artisans at \"da Vinci,\" the manufacturer behind the custom barrel \"Guren \/ Raizen\" series, and SPARK's concept. From there, further improvements were made to various parts, resulting in the birth of the \"Hiei® Kai,\" the ultimate refined inner barrel.\u003c\/p\u003e\n\n\u003cp\u003eIt is made from the highest quality domestically produced SUS304 stainless steel, manufactured through cold forging, and precisely machined using a domestic high-precision CNC machine.\u003c\/p\u003e\n\n\u003cp\u003eTo achieve stable hop engagement, meticulous attention has been paid to the shape and polishing of the hop window, significantly reducing wear below the hop window and the adhesion of dirt to the inner wall that occurs when applying hop.\u003c\/p\u003e\n\n\u003cp\u003eThe barrel's end features an unprecedented 20mm long taper, which reduces exit loss in fluid dynamics, improving accuracy and range.\u003c\/p\u003e\n\n\u003cp\u003e*The airsoft gun inner barrel \"Hiei\" is a registered trademark of SPARK Co., Ltd.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e■For Next-Gen MP5\/EVOLT\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eComplies with the standards of Tokyo Marui Next-Gen Electric Gun MP5 series and Tokyo Marui EVOLT series.\u003cbr\u003eAs there are no clear standards defined, please understand that some overseas products, even if they claim the same standard, may not be compatible.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e【Features of Hiei® Kai】\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eSuper Polished Hop Window\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003eFor stable trajectories, stable \"hop-up engagement\" is crucial.\u003c\/li\u003e\n\n\u003cli\u003eArtisans meticulously polish the inner wall, including the area around the hop window, to eliminate unpredictable factors affecting BBs.\u003c\/li\u003e\n\n\u003cli\u003eThe hop window is processed with \"round cutting,\" which is extremely difficult, ensuring smooth movement of the hop packing and maximizing its performance.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003cb\u003e20 mm Ultra-Long Taper\u003c\/b\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003eExtremely hard cold-forged stainless steel is very difficult to process due to its hardness, requiring a high-precision CNC machine, selection of cutting tools by skilled artisans, and precise machining programs. The unprecedented 20mm ultra-long taper suppresses rapid changes in resistance and increases in turbulence coefficient around the barrel exit, eliminating negative impacts on accuracy.\u003c\/li\u003e\n\n\u003cli\u003eThis brings out the gun's inherent accuracy to its utmost limit.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003cb\u003ePride in Japanese Manufacturing\u003c\/b\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003eThe intricate round cutting of the hop window, the polishing of the barrel's inner surface, and the long taper processing at the muzzle end are easy to describe in words, but creating an ultra-precise inner barrel from difficult-to-process cold-forged stainless steel requires high technical skill.\u003c\/li\u003e\n\n\u003cli\u003e\"Hiei® Kai\" is a MADE IN JAPAN product that Japan is proud to present to the world.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"SPARK","offers":[{"title":"Default Title","offer_id":48432874619139,"sku":"SPARK-HIEI-05-NME-229","price":46.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0405\/1684\/5735\/files\/SPARK-HIEI-05-NME-229.jpg?v=1781757474","url":"https:\/\/rock-et.jp\/en-eu\/products\/spark-hiei-05-nme-229","provider":"ROCK-et","version":"1.0","type":"link"}