{"product_id":"polastar-kythera-sa-nozzle-7","title":"Polarstar Kythera® SA Nozzle (Type: #7)","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" tabindex=\"-1\" data-turn-id=\"request-694dc732-9460-8326-8615-5f1310b2ffef-17\" data-testid=\"conversation-turn-158\" data-scroll-anchor=\"true\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"733b30a6-13a6-441f-a8ee-b81e94fbb6bc\" data-message-model-slug=\"gpt-5-2\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full break-words dark markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"405\"\u003eThe \u003cstrong data-start=\"4\" data-end=\"46\"\u003ePolarStar Kythera® SA Nozzle (Type #7)\u003c\/strong\u003e is a precision-engineered upgrade component designed specifically for PolarStar Kythera HPA cylinder conversion engines. Built to exacting tolerances and manufactured from durable brass, this drop-in nozzle plays a critical role in achieving proper air seal, consistent BB feeding, and reliable overall performance in mechanically driven HPA airsoft systems.\u003c\/p\u003e\n\u003ch3 data-start=\"407\" data-end=\"453\"\u003ePrecision Fit for Consistent Performance\u003c\/h3\u003e\n\u003cp data-start=\"454\" data-end=\"978\"\u003eIn any HPA-powered airsoft rifle, nozzle length is one of the most important variables affecting performance. Even slight differences in nozzle length can dramatically impact how well BBs seat in the hop-up chamber, how consistently air is delivered, and ultimately how accurate and reliable the rifle feels in-game. The PolarStar Kythera SA #7 Nozzle is designed to address these challenges by providing a precisely measured length that aligns the engine’s air output perfectly with the hop-up chamber in compatible builds.\u003c\/p\u003e\n\u003cp data-start=\"980\" data-end=\"1416\"\u003eUnlike traditional AEG platforms where one nozzle may fit a specific gun model universally, HPA cylinder conversion systems introduce additional variables. Gearbox shell thickness, hop-up positioning, and manufacturer-specific tolerances can all change how far the cylinder sits from the hop-up unit. As a result, the same rifle model from two different manufacturers may require different nozzle lengths to achieve optimal performance.\u003c\/p\u003e\n\u003ch3 data-start=\"1418\" data-end=\"1456\"\u003eNumbered Nozzle System Explained\u003c\/h3\u003e\n\u003cp data-start=\"1457\" data-end=\"1903\"\u003eTo solve this issue, PolarStar uses a \u003cstrong data-start=\"1495\" data-end=\"1521\"\u003enumbered nozzle system\u003c\/strong\u003e rather than labeling nozzles by rifle model. The #7 designation refers to a specific nozzle length that has been tested and measured to work best in a range of common platforms and gearbox configurations. While the #7 nozzle is most commonly associated with certain replicas, it may also be compatible with additional builds depending on manufacturer tolerances and internal setup.\u003c\/p\u003e\n\u003cp data-start=\"1905\" data-end=\"2348\"\u003eOnce you determine the correct nozzle number for your replica, that number becomes \u003cstrong data-start=\"1988\" data-end=\"2026\"\u003euniversal across PolarStar engines\u003c\/strong\u003e that use the numbered nozzle system. This means if your build requires a #7 nozzle for a Kythera engine, it will also use a #7 nozzle for PolarStar F2 or JACK engines should you ever switch systems in the future. This standardized approach makes long-term upgrades and platform changes far easier and more cost-effective.\u003c\/p\u003e\n\u003ch3 data-start=\"2350\" data-end=\"2387\"\u003eHigh-Quality Brass Construction\u003c\/h3\u003e\n\u003cp data-start=\"2388\" data-end=\"2810\"\u003eThe Kythera SA #7 Nozzle is machined from solid brass, chosen for its excellent durability, wear resistance, and smooth surface finish. Brass nozzles maintain their dimensions under repeated cycling and resist deformation over time, even in high-use or high-pressure setups. The smooth finish also helps reduce friction against BBs and hop-up components, promoting reliable feeding and consistent shot-to-shot performance.\u003c\/p\u003e\n\u003ch3 data-start=\"2812\" data-end=\"2861\"\u003eDesigned for Kythera Mechanical HPA Engines\u003c\/h3\u003e\n\u003cp data-start=\"2862\" data-end=\"3214\"\u003eAs a drop-in component, this nozzle is specifically designed for PolarStar Kythera SA engines and installs easily during engine setup or tuning. Proper nozzle selection helps prevent common issues such as double-feeding, mid-cap misfeeds, inconsistent FPS, or poor air seal—issues that can otherwise undermine the advantages of a mechanical HPA system.\u003c\/p\u003e\n\u003ch3 data-start=\"3216\" data-end=\"3251\"\u003eImportant Compatibility Notes\u003c\/h3\u003e\n\u003cp data-start=\"3252\" data-end=\"3725\"\u003eMost numbered nozzles, including the #7, are clearly marked for easy identification. The only exception is the #1 nozzle, which is unmarked due to high production volume. Additionally, Kythera engines built for specific replicas with non-standard cylinder lengths—such as certain SR-25 variants—use special nozzles marked with a “K” prefix. These non-standard cylinders do not follow the universal numbering system, though their nozzle profiles remain compatible in design.\u003c\/p\u003e\n\u003ch3 data-start=\"3727\" data-end=\"3757\"\u003eFine-Tune Your HPA Build\u003c\/h3\u003e\n\u003cp data-start=\"3758\" data-end=\"4098\"\u003eWhether you’re optimizing an existing Kythera setup or building a new mechanical HPA rifle from the ground up, the PolarStar Kythera® SA Nozzle #7 is a critical tuning component. By ensuring correct alignment, consistent air delivery, and reliable feeding, this precision nozzle helps your rifle perform exactly as intended—shot after shot.\u003c\/p\u003e\n\u003cp data-start=\"4100\" data-end=\"4127\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"4100\" data-end=\"4117\"\u003eManufacturer:\u003c\/strong\u003e PolarStar\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\n\u003cdiv class=\"text-center\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pointer-events-none h-px w-px absolute bottom-0\" aria-hidden=\"true\" data-edge=\"true\"\u003e\u003c\/div\u003e\n","brand":"Polarstar","offers":[{"title":"Default Title","offer_id":47994913915110,"sku":"22814","price":43.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/6393\/2390\/files\/8119_polarstar-22814-removebg-preview.png?v=1784175299","url":"https:\/\/ngrwzj-i1.myshopify.com\/products\/polastar-kythera-sa-nozzle-7","provider":"CQC Airsoft ","version":"1.0","type":"link"}