{"product_id":"polarstar-gearbox-shim-set-cylinder-conversion","title":"Polarstar Gearbox Shim Set for Cylinder Conversion Kits (Size: 0.152\")","description":"\u003ch3 data-start=\"212\" data-end=\"280\"\u003ePolarStar Gearbox Shim Set for Cylinder Conversion Kits (0.152\")\u003c\/h3\u003e\n\u003cp data-start=\"282\" data-end=\"631\"\u003eThe \u003cstrong data-start=\"286\" data-end=\"325\"\u003ePolarStar Gearbox Shim Set (0.152\")\u003c\/strong\u003e is a precision tuning component designed to secure PolarStar HPA cylinder conversion kits inside AEG gearbox shells. By eliminating unwanted cylinder movement, this shim set helps maintain proper nozzle alignment, consistent air seal, and reliable feeding—critical factors for high-performance HPA builds.\u003c\/p\u003e\n\u003cp data-start=\"633\" data-end=\"1089\"\u003eDuring HPA conversions, gearbox shell pin sizes can vary depending on manufacturer. To ensure universal compatibility, PolarStar cylinder conversion kits are manufactured with pin holes large enough to accept the largest common pin diameters. In some gearboxes with smaller pins, this can allow the cylinder to shift forward or backward during operation. Even minimal movement can negatively affect performance by altering nozzle protrusion and BB seating.\u003c\/p\u003e\n\u003cp data-start=\"1091\" data-end=\"1404\"\u003eThese precision brass shims are designed to take up that excess space and firmly lock the cylinder in place within the gearbox shell. Once installed, the cylinder remains properly positioned throughout the firing cycle, ensuring consistent nozzle extension, improved air seal, and stable shot-to-shot performance.\u003c\/p\u003e\n\u003cp data-start=\"1406\" data-end=\"1795\"\u003eManufactured from \u003cstrong data-start=\"1424\" data-end=\"1446\"\u003ehigh-quality brass\u003c\/strong\u003e, the shims offer excellent durability, resistance to deformation, and long-term reliability. Brass is ideal for this application due to its strength and ability to maintain precise tolerances under repeated stress. The \u003cstrong data-start=\"1666\" data-end=\"1686\"\u003e0.152\" thickness\u003c\/strong\u003e is one of the most common sizes required for correcting pin tolerance differences in popular gearbox shells.\u003c\/p\u003e\n\u003cp data-start=\"1797\" data-end=\"2107\"\u003eThis shim set is engineered for easy installation and is compatible with most standard AEG gearbox designs, including common Version 2 and Version 3 platforms. No permanent modification is required, making it an ideal solution for both new HPA builds and existing systems experiencing inconsistent performance.\u003c\/p\u003e\n\u003cp data-start=\"2109\" data-end=\"2191\"\u003eBy preventing cylinder movement, the PolarStar Gearbox Shim Set directly improves:\u003c\/p\u003e\n\u003cul data-start=\"2192\" data-end=\"2329\"\u003e\n\u003cli data-start=\"2192\" data-end=\"2224\"\u003e\n\u003cp data-start=\"2194\" data-end=\"2224\"\u003eNozzle alignment consistency\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2225\" data-end=\"2251\"\u003e\n\u003cp data-start=\"2227\" data-end=\"2251\"\u003eBB seating reliability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2252\" data-end=\"2275\"\u003e\n\u003cp data-start=\"2254\" data-end=\"2275\"\u003eAir seal efficiency\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2276\" data-end=\"2293\"\u003e\n\u003cp data-start=\"2278\" data-end=\"2293\"\u003eFPS stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2294\" data-end=\"2329\"\u003e\n\u003cp data-start=\"2296\" data-end=\"2329\"\u003eOverall accuracy and efficiency\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2331\" data-end=\"2421\"\u003eThe shims are fully compatible with \u003cstrong data-start=\"2367\" data-end=\"2409\"\u003eall PolarStar cylinder conversion kits\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul data-start=\"2422\" data-end=\"2496\"\u003e\n\u003cli data-start=\"2422\" data-end=\"2438\"\u003e\n\u003cp data-start=\"2424\" data-end=\"2438\"\u003ePolarStar F2\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2439\" data-end=\"2455\"\u003e\n\u003cp data-start=\"2441\" data-end=\"2455\"\u003ePolarStar F1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2456\" data-end=\"2474\"\u003e\n\u003cp data-start=\"2458\" data-end=\"2474\"\u003ePolarStar JACK\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2475\" data-end=\"2496\"\u003e\n\u003cp data-start=\"2477\" data-end=\"2496\"\u003ePolarStar Kythera\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2498\" data-end=\"2899\"\u003eFor HPA users, techs, and competitive players, this shim set is an essential tuning component. It protects your HPA investment and ensures your engine operates exactly as intended inside the gearbox shell. If you’re aiming for maximum consistency, reliability, and performance from your PolarStar setup, the \u003cstrong data-start=\"2806\" data-end=\"2833\"\u003e0.152\" Gearbox Shim Set\u003c\/strong\u003e is a small but critical upgrade that delivers measurable results.\u003c\/p\u003e\n\u003cp data-start=\"2901\" data-end=\"2928\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"2901\" data-end=\"2918\"\u003eManufacturer:\u003c\/strong\u003e PolarStar\u003c\/p\u003e\n","brand":"Polarstar","offers":[{"title":"Default Title","offer_id":47994913030374,"sku":"25645","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/6393\/2390\/files\/8116_polarstar-25645-removebg-preview-1.png?v=1784175299","url":"https:\/\/ngrwzj-i1.myshopify.com\/products\/polarstar-gearbox-shim-set-cylinder-conversion","provider":"CQC Airsoft ","version":"1.0","type":"link"}