{"product_id":"polarstar-airsoft-jack-electro-pneumatic-gearbox-conversion-kit-model-m249-1","title":"PolarStar Airsoft JACK Electro-Pneumatic Gearbox Conversion Kit (Model: M249)","description":"\u003cp data-start=\"0\" data-end=\"153\"\u003ePolarStar JACK Electro-Pneumatic Gearbox Conversion Kit — M249 Model\u003cbr data-start=\"68\" data-end=\"71\"\u003ePrecision HPA power for your AEG: faster, cleaner, and more consistent than gears.\u003c\/p\u003e\r\n\u003cp data-start=\"155\" data-end=\"679\"\u003eIf you’re ready to leave noisy gear trains behind and step into the world of true electro-pneumatic performance, the \u003cstrong data-start=\"272\" data-end=\"297\"\u003ePolarStar JACK (M249)\u003c\/strong\u003e conversion kit is built to do exactly that. Designed and manufactured in the U.S.A., JACK is a compact, no-nonsense HPA conversion that drops into your gearbox shell and turns a compatible AEG into an instantaneously responsive, highly tunable HPA platform. The M249-specific configuration gives belt-fed operators the efficiency and reliability they need for heavy sustained fire.\u003c\/p\u003e\r\n\u003cp data-start=\"681\" data-end=\"1539\"\u003eWhy JACK? — The advantages at a glance\u003cbr data-start=\"719\" data-end=\"722\"\u003e• \u003cstrong data-start=\"724\" data-end=\"758\"\u003eInstantaneous trigger response\u003c\/strong\u003e — JACK reacts faster than even a Li-Po-powered AEG. Pull the trigger and the shot is delivered with surgical timing.\u003cbr data-start=\"875\" data-end=\"878\"\u003e• \u003cstrong data-start=\"880\" data-end=\"909\"\u003eSuperior shot consistency\u003c\/strong\u003e — CNC aluminum components, an optimized flow profile, and a high-performance Delrin nozzle deliver tight FPS spread and repeatable performance.\u003cbr data-start=\"1053\" data-end=\"1056\"\u003e• \u003cstrong data-start=\"1058\" data-end=\"1084\"\u003eUltra simple internals\u003c\/strong\u003e — JACK has only one moving part (the nozzle\/poppet), which makes it incredibly reliable, easy to maintain, and easy to service in the field.\u003cbr data-start=\"1225\" data-end=\"1228\" data-is-only-node=\"\"\u003e• \u003cstrong data-start=\"1230\" data-end=\"1267\"\u003eHigh and low temperature reliable\u003c\/strong\u003e — JACK is engineered to function in damp, freezing, or otherwise harsh climates without compromising performance.\u003cbr data-start=\"1381\" data-end=\"1384\"\u003e• \u003cstrong data-start=\"1386\" data-end=\"1409\"\u003eEfficient air usage\u003c\/strong\u003e — Minimal dead volume, refined flow paths, and precise dwell control mean more shots per tank compared to many competing systems.\u003c\/p\u003e\r\n\u003cp data-start=\"1541\" data-end=\"2053\"\u003eBuilt for customization and control\u003cbr data-start=\"1576\" data-end=\"1579\"\u003eJACK is more than a drop-in replacement — it’s a fully programmable fire control solution. The included \u003cstrong data-start=\"1683\" data-end=\"1710\"\u003eFire Control Unit (FCU)\u003c\/strong\u003e features an LCD and five-position joystick that let you set cyclic rate, poppet dwell, and fire modes on the fly. Choose between \u003cstrong data-start=\"1840\" data-end=\"1858\"\u003eSemi\/Full Auto\u003c\/strong\u003e, \u003cstrong data-start=\"1860\" data-end=\"1873\"\u003eSemi Only\u003c\/strong\u003e, and \u003cstrong data-start=\"1879\" data-end=\"1897\"\u003eVariable Burst\u003c\/strong\u003e modes to match your ruleset or mission. The FCU is compact and MOSFET-sized so it fits neatly in common battery compartments alongside a small Li-ion pack.\u003c\/p\u003e\r\n\u003cp data-start=\"2055\" data-end=\"2504\"\u003ePerformance you can tune\u003cbr data-start=\"2079\" data-end=\"2082\"\u003eVelocity is adjusted by a combination of regulated input pressure and precise poppet dwell — giving you predictable, fine-increment control over FPS (for example, an M4 platform can be tuned from under 280 FPS up to roughly 500 FPS with a .20g BB). JACK’s universal cylinder design is compatible with a range of gearbox versions that use center-line nozzles, making it flexible for multiple platforms when properly set up.\u003c\/p\u003e\r\n\u003cp data-start=\"2506\" data-end=\"2932\"\u003eMade for durability and simplicity\u003cbr data-start=\"2540\" data-end=\"2543\"\u003eAssembled from \u003cstrong data-start=\"2558\" data-end=\"2583\"\u003eCNC machined aluminum\u003c\/strong\u003e with a high-performance \u003cstrong data-start=\"2608\" data-end=\"2625\"\u003eDelrin nozzle\u003c\/strong\u003e, JACK is intentionally minimal: six parts total and easily disassembled by hand. The nozzle serves as the poppet valve piloted by a solenoid — the same core principle used in PolarStar’s Fusion Engine — which gives JACK its distinctive, crisp muzzle report while keeping mechanical complexity to a minimum.\u003c\/p\u003e\r\n\u003cp data-start=\"2934\" data-end=\"3189\"\u003eWhat you need to operate JACK (not included)\u003cbr data-start=\"2978\" data-end=\"2981\"\u003e• A complete TM-spec AEG with a gearbox shell (JACK installs into the gearbox shell)\u003cbr data-start=\"3065\" data-end=\"3068\"\u003e• Regulated air rig + HPA tank (never use CO₂\/propane with JACK)\u003cbr data-start=\"3132\" data-end=\"3135\"\u003e• Small Li-ion battery for the FCU (sold separately)\u003c\/p\u003e\r\n\u003cp data-start=\"3191\" data-end=\"3603\"\u003eSafety \u0026amp; HPA best practices (must read)\u003cbr data-start=\"3230\" data-end=\"3233\"\u003eJACK requires HPA or nitrogen only — \u003cstrong data-start=\"3270\" data-end=\"3299\"\u003edo not use CO₂ or propane\u003c\/strong\u003e. Follow HPA safety rules: never add oil to tank fill valves, use trained professionals to refill tanks, verify regulator pressure (do not exceed 120 PSI), hydro-test tanks per manufacturer recommendations, and always transport and store tanks safely. Always shut off your tank and bleed lines after use.\u003c\/p\u003e\r\n\u003cp data-start=\"3605\" data-end=\"4066\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eFinal word\u003cbr data-start=\"3615\" data-end=\"3618\"\u003ePolarStar’s JACK (M249) brings HPA’s speed, consistency, and tunability into a compact, field-serviceable package that transforms how an AEG performs. If you want the crisp trigger, adjustable fire modes, and rock-steady shot-to-shot consistency of a high-end HPA system — but with minimal complexity — JACK is one of the smartest conversions you can make. Built in the USA, serviceable in seconds, and tuned on the fly, JACK is HPA made practical.\u003c\/p\u003e","brand":"Polarstar","offers":[{"title":"Default Title","offer_id":47468099404006,"sku":null,"price":490.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/6393\/2390\/files\/dd9cca1a-sjv2-m4-1-removebg-preview.png?v=1774002138","url":"https:\/\/ngrwzj-i1.myshopify.com\/products\/polarstar-airsoft-jack-electro-pneumatic-gearbox-conversion-kit-model-m249-1","provider":"CQC Airsoft ","version":"1.0","type":"link"}