{"product_id":"airtac-monk-esg-polarstar-fusion-engine-hpa-m4","title":"Airtac Monk ESG Polarstar Fusion Engine HPA M4","description":"\u003ch3\u003eAirtac Monk ESG Polarstar Fusion Engine HPA M4\u003c\/h3\u003e\u003cp\u003eMade for extreme speedsoft performance — the Monk ESG pairs a Polarstar Fusion Engine with a fully tuned Airtac platform for a rifle that hits hard and responds instantly. KA Tech tuned to 350 FPS @ 90 PSI.\u003c\/p\u003e\u003ch4\u003eHighlights\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMonk ESG grip housing a Polarstar MR2 regulator for consistent, tunable air delivery\u003c\/li\u003e\n\u003cli\u003eGenuine G\u0026amp;G lower for a true, mil-spec-feel trigger group fit\u003c\/li\u003e\n\u003cli\u003ePowered by a Polarstar Fusion Engine — the most powerful HPA engine we run\u003c\/li\u003e\n\u003cli\u003eSilver curved speed trigger for a fast, tactile pull\u003c\/li\u003e\n\u003cli\u003eClean 3D-printed end cap finish\u003c\/li\u003e\n\u003cli\u003eMaxx M4E hop-up unit with a flat hop and Maple Leaf bucking for locked-in accuracy\u003c\/li\u003e\n\u003cli\u003e6.02 precision inner barrel\u003c\/li\u003e\n\u003cli\u003eAvailable in Gold or Red Airtac Upper\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhy This Build\u003c\/h4\u003e\u003cp\u003eBuilt for speedsoft, where every millisecond of trigger response matters. The Fusion Engine platform gives the Monk ESG elite-level speed and reliable HPA performance, tuned and inspected by KA Tech before it ships.\u003c\/p\u003e\u003ch4\u003eIncluded\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eComplete Airtac Monk ESG Polarstar Fusion Engine HPA M4\u003c\/li\u003e\n\u003cli\u003eField-ready assembly and inspection\u003c\/li\u003e\n\u003cli\u003eKA Tech support for setup questions\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KA Tech Airsoft","offers":[{"title":"Gold Airtac Upper","offer_id":46113341603874,"sku":"KA-MONKESG-GOLD","price":1200.0,"currency_code":"USD","in_stock":true},{"title":"Red Airtac Upper","offer_id":46113341636642,"sku":"KA-MONKESG-RED","price":1200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_Jul_27_2026_07_43_37_PM_3.png?v=1785206663","url":"https:\/\/www.katechairsoft.com\/products\/airtac-monk-esg-polarstar-fusion-engine-hpa-m4","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}