{"product_id":"polarstar-cgs-stock-system","title":"PolarStar CGS™ Stock System","description":"\u003cp\u003eThe PolarStar CGS™ lets you run a high-performance HPA system with the realistic appearance of a standard Milspec buffer tube — no airline tether, no tank screwed into the back of your rifle. Machined from a real Milspec buffer tube blank, it conceals an adjustable regulator and CO2 cartridge while remaining compatible with all Milspec AR stocks.\u003c\/p\u003e\n\n\u003cp\u003eIts integral regulator shares the same proven internal design as the UGS™ and Micro Reg GEN2, delivering 40–130psi output adjustable with a 3\/32 allen key and lockable with a zip tie. Optional High Pressure Spring (p\/n 10000692) boosts maximum output to ~200psi.\u003c\/p\u003e\n\n\u003ch4\u003eCO2 Inserts\u003c\/h4\u003e\n\u003cp\u003eSwappable 12g and 33g CO2 inserts feature an integral expansion chamber, anti-siphon system, 5-micron filter, and check valve to prevent liquid CO2 from entering the regulator regardless of rifle orientation. The check valve also conserves CO2 during combat reloads.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e12g insert: ~180 shots at 1.5J \/ .28g \/ 6.05×380mm barrel (with F2™)\u003c\/li\u003e\n\u003cli\u003e33g insert: ~500 shots at the same settings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eConfigurations\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 1:\u003c\/strong\u003e For AEG receivers accepting 1-3\/16\"-16 threaded buffer tubes (gearbox modification required).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType 2:\u003c\/strong\u003e For traditional TM Spec M4 receivers (receiver and gearbox modification required).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMachined from a Milspec AR buffer tube blank\u003c\/li\u003e\n\u003cli\u003eCompatible with Milspec AR stocks\u003c\/li\u003e\n\u003cli\u003eSimple zip-tie tournament lock\u003c\/li\u003e\n\u003cli\u003eOnly 2 o-rings — easy to maintain\u003c\/li\u003e\n\u003cli\u003eWorks with F2™, JACK™, Kythera™ and other HPA cylinder systems\u003c\/li\u003e\n\u003cli\u003eNot compatible with Fusion Engine™\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMin Output Pressure: 40 PSI\u003c\/li\u003e\n\u003cli\u003eMax Output Pressure: 130 PSI (~200 PSI with HP Spring, p\/n 10000692)\u003c\/li\u003e\n\u003cli\u003eMax Input Pressure: 900 PSI\u003c\/li\u003e\n\u003cli\u003eOutputs: Interfaces w\/ Airline (6mm OD x 4mm ID)\u003c\/li\u003e\n\u003cli\u003eWarranty: 1 Year Limited\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eCO2 Cartridges \u0026amp; HP Spring not included.\u003c\/em\u003e\u003c\/p\u003e","brand":"PolarStar","offers":[{"title":"Type 1 12g CO2 (RS Spec)","offer_id":45868780322850,"sku":"10000536","price":244.25,"currency_code":"USD","in_stock":true},{"title":"Type 1 33g CO2 (RS Spec)","offer_id":45868780355618,"sku":"10000611","price":216.5,"currency_code":"USD","in_stock":true},{"title":"Type 2 12g CO2 (TM Spec)","offer_id":45868780388386,"sku":"10000535","price":258.0,"currency_code":"USD","in_stock":true},{"title":"Type 2 33g CO2 (TM Spec)","offer_id":45868780421154,"sku":"10000612","price":234.0,"currency_code":"USD","in_stock":true},{"title":"CO2 Insert 12g","offer_id":45868780453922,"sku":"10000537","price":114.5,"currency_code":"USD","in_stock":true},{"title":"CO2 Insert 33g","offer_id":45868780486690,"sku":"10000538","price":91.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_Jun_19_2026_10_25_50_PM_10.png?v=1781933198","url":"https:\/\/www.katechairsoft.com\/products\/polarstar-cgs-stock-system","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}