{"product_id":"polarstar-jack-hpa-engine-m249","title":"PolarStar Jack HPA Engine (M249)","description":"\u003cdiv\u003e\n\u003ch1\u003ePolarStar JACK HPA Engine (M249)\u003c\/h1\u003e\n\u003cp\u003eThe PolarStar JACK HPA Engine is an affordable, high-performance High Pressure Air conversion designed for AEGs, offering a drop-in cylinder replacement that delivers reliable, programmable air control. It’s ideal for players seeking consistent power and easier upgrades without the complexity of traditional gear-driven systems.\u003c\/p\u003e \u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/JACK_Parts_1200x500.jpg?v=1553542544\"\u003e\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/JACK_Mirror_1200x500_ffb6ba28-ed36-4fba-b04c-cb298e785406.jpg?v=1553543390\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0023\/7466\/4301\/files\/JACK_Gel.jpg?v=1631803323\" alt=\"Gel Blaster JACK\"\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDrop-in, center-line nozzle compatibility\u003c\/b\u003e: Universally compatible with a wide range of gearbox versions that use center-line nozzles for straightforward installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProgrammable pneumatic system\u003c\/b\u003e: Replaces traditional gearbox components with a precise, adjustable air-control setup for stable, repeatable power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSingle moving part design\u003c\/b\u003e: The nozzle acts as its own poppet valve, reducing wear and simplifying maintenance compared to solenoid-only arrangements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHigh air flow for strong muzzle velocity\u003c\/b\u003e: Delivers greater air volume down the barrel, achieving robust performance without sacrificing reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVelocity range and adjustability\u003c\/b\u003e: With 130 psi input, velocity can range from under 280fps up to about 500fps using a 0.20g BB; longer barrels can raise the ceiling, while shorter barrels lower it—no nozzle swaps required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eROF up to 30 rps\u003c\/b\u003e: Realistic cyclic rate achievable in standard configurations, contingent on magazine quality and BBs used.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAir efficiency\u003c\/b\u003e: 1000+ shots from a 13\/3000 fill at 1.5J with a 0.28g BB, thanks to optimized airflow and minimized dead volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComprehensive kit inclusion\u003c\/b\u003e: Each kit includes a pre-installed Filter Fitting, FCU, Switchboard, Wire Harness, and all components needed to convert your specific rifle model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFlexible configuration options\u003c\/b\u003e: Gel ball compatible configurations available; HPA Tank, Air Rig (regulator and line), and Battery are purchased separately.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the JACK HPA Engine, you gain dependable power, precise tuning, and improved efficiency over traditional gas and gear-driven setups. The drop-in design reduces downtime and maintenance, while the single-part nozzle minimizes failure points and supports consistent performance across shots and environments. adjustable input pressure lets you tailor velocity quickly for different fields or play styles, all without swapping hardware. For players who want more shots per fill, tighter consistency, and a straightforward upgrade path, the PolarStar JACK delivers a clear, practical upgrade to your AEG build.\u003c\/p\u003e \u003cbr\u003e \u003ctable height=\"404\" width=\"549\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVelocity: 500fps w\/.20g @ 130psi\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThe JACK™ allows for easy velocity adjustment by changing input pressure and does not require different nozzles to reach its full velocity range. Using a standard M4 as an example, velocity can be adjusted from below 280fps and up to approximately 500fps with a.20g BB. Velocity can vary per model as longer barrels will increase the maximum velocity while shorter barrels will decrease it. \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eROF: 30rps\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThe maximum cyclic rate of the JACK™ is affected by several factors such as the operating pressure as well as quality of the magazine and BB's used. However, 30 rounds per second is achievable in most standard configurations.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAir Efficiency: 1000+ shots from 13\/3000 @ 1.5J w\/.28g\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlthough not a critical requirement during development, JACK™ does boast some highly respectable figures in this category. This is made possible by its intelligently laid out design which minimizes dead volume resulting in better air flow, faster response and less air used per shot.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e(Test Configuration: 6.05x375mm Barrel)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Socom Tactical Airsoft","offers":[{"title":"Default Title","offer_id":56972346097989,"sku":"10000748","price":328.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/3767\/0213\/files\/polarstar-jack-hpa-engine-m249-1375394.jpg?v=1769550971","url":"https:\/\/www.longshottactical.co.uk\/products\/polarstar-jack-hpa-engine-m249","provider":"Longshot Tactical","version":"1.0","type":"link"}