{"product_id":"polarstar-f2-hpa-kit","title":"PolarStar F2™ HPA Conversion Kit","description":"\u003cp\u003eWinner of \"Best HPA Engine\" in the 9th Airsoft Players' Choice Awards, the F2™ delivers the same legendary dual solenoid performance as the Fusion Engine™ in a more compact, efficient, and flexible package. Independently adjustable nozzle and poppet valve give you unparalleled control over loading time and air volume — plus the ability to switch between true closed bolt and \"AEG\" firing modes. PolarStar Filter Fitting included.\u003c\/p\u003e\n\n\u003cp\u003eThe F2™ features a new one-piece lightweight poppet valve that operates at lower pressures and uses less air volume than the Fusion Engine™ poppet, optimizing efficiency. Its spring-biased forward nozzle provides consistent loading force regardless of operating pressure.\u003c\/p\u003e\n\n\u003ch4\u003eGel Ball Compatible\u003c\/h4\u003e\n\u003cp\u003eF2 kits can be configured for gel ball systems. 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 Up to 480fps w\/ .20g @ 145psi — full range (below 280fps to 480fps) achievable with a single nozzle just by adjusting pressure\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\u003eAir Efficiency:\u003c\/strong\u003e 1000+ shots from 13\/3000 @ 1.5J w\/ .28g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Pressure:\u003c\/strong\u003e 45–145psi\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PolarStar","offers":[{"title":"V2, M4\/M16","offer_id":45868775276578,"sku":"10000258","price":440.0,"currency_code":"USD","in_stock":true},{"title":"V3, AK","offer_id":45868775309346,"sku":"10000569","price":443.0,"currency_code":"USD","in_stock":true},{"title":"M249","offer_id":45868775342114,"sku":"10000574","price":441.0,"currency_code":"USD","in_stock":true},{"title":"Ares EFCS \/ APS eSE","offer_id":45868775374882,"sku":"10000337","price":447.25,"currency_code":"USD","in_stock":true},{"title":"Ares M4","offer_id":45868775407650,"sku":"10000580","price":448.75,"currency_code":"USD","in_stock":true},{"title":"VFC HK417","offer_id":45868775440418,"sku":"10000399","price":455.75,"currency_code":"USD","in_stock":true},{"title":"M60","offer_id":45868775473186,"sku":"10001316","price":438.0,"currency_code":"USD","in_stock":true},{"title":"KAC LMG","offer_id":45868775505954,"sku":"10000806","price":443.5,"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_2.png?v=1781933180","url":"https:\/\/www.katechairsoft.com\/products\/polarstar-f2-hpa-kit","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}