{"product_id":"polarstar-kythera-sa-kit","title":"PolarStar Kythera SA™ Drop-In Conversion Kit","description":"\u003cp\u003eThe Kythera SA™ is PolarStar's most eagerly anticipated product in over a decade — and a radical departure from everything that came before it. The Kythera uses \u003cstrong\u003eno battery, no FCU, and no electronics whatsoever\u003c\/strong\u003e. It is completely mechanical, completely waterproof, and completely unlike anything else on the market. PolarStar Filter Fitting included.\u003c\/p\u003e\n\n\u003cp\u003eNamed after the Antikythera Mechanism — a 2nd-century B.C. astronomical computer so advanced that scientists studied it for decades to understand its purpose — the Kythera valve mechanism is similarly intelligent: few parts, easy to maintain, yet incorporating design principles found nowhere else in airsoft.\u003c\/p\u003e\n\n\u003ch4\u003eWhat Makes It Unique\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRealistic Trigger:\u003c\/strong\u003e Hardened alloy steel sears catch and release a stainless steel spool valve exactly as a real single-action firearm trigger operates. Distinct break, distinct reset. Adjustable for weight, length of pull, and over travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Shot Cycle on Pull:\u003c\/strong\u003e Delivers proven closed bolt performance mechanically. No trigger release required before the next round chambers. Ready to fire again before the trigger fully resets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Efficiency:\u003c\/strong\u003e No pilot valve — 100% of air goes through the nozzle. Consistent valve release every shot regardless of trigger input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Charging Cord:\u003c\/strong\u003e Steel cocking cord routes through the grip or attaches to the charging handle for field access if the system stalls (typically only if run completely out of air).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Installs as a single assembly into a standard gearbox. No gearbox modification typically required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eGel Ball Compatible\u003c\/h4\u003e\n\u003cp\u003eKythera SA kits can be configured for gel ball use (7–8mm projectiles). Contact us for details.\u003c\/p\u003e\n\n\u003ch4\u003ePerformance\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVelocity:\u003c\/strong\u003e 270–500fps w\/ .20g (6.05×380mm barrel) across 60–180psi operating range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eROF:\u003c\/strong\u003e 30rps in most standard configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Pressure Range:\u003c\/strong\u003e 60–180psi — one system covers CQB to DMR by adjusting input pressure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable:\u003c\/strong\u003e Nozzle dwell, return speed, trigger weight, length of pull, over travel\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PolarStar","offers":[{"title":"Semi-Auto, V2, M4\/M16","offer_id":45868775178274,"sku":"10000774","price":288.0,"currency_code":"USD","in_stock":true},{"title":"Semi-Auto, V3, AK","offer_id":45868775211042,"sku":"10001002","price":288.0,"currency_code":"USD","in_stock":true},{"title":"Semi-Auto, V2.5, JG SR-25","offer_id":45868775243810,"sku":"10001003","price":303.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_Jun_19_2026_10_25_47_PM_4.png?v=1781933186","url":"https:\/\/www.katechairsoft.com\/products\/polarstar-kythera-sa-kit","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}