{"product_id":"polarstar-ugs-stock-rail","title":"PolarStar UGS™ Stock Rail","description":"\u003cp\u003eThe UGS™ Stock Rail provides the indexing and length adjustment normally handled by the rail on a buffer tube. Swap between rails on your UGS™ to reconfigure the stock for Milspec CO2 inserts and Milspec stocks, or 2.000\" diameter HPA tanks and 2.000\" stocks such as the G\u0026amp;P R3 and similar paintball-style stocks.\u003c\/p\u003e\n\u003cp\u003eAll UGS™ stocks for M4-series models use the \u003cstrong\u003eOriginal\u003c\/strong\u003e rails. All UGS™ stocks for HK417 models use the \u003cstrong\u003eR01\u003c\/strong\u003e rails.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMilspec Diameter, Original\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHPA (2.000\") Diameter, Original\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMilspec Diameter, R01\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHPA (2.000\") Diameter, R01\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PolarStar","offers":[{"title":"Original HPA (Limited)","offer_id":45868781568034,"sku":"10000117","price":32.0,"currency_code":"USD","in_stock":true},{"title":"Original Milspec (Limited)","offer_id":45868781600802,"sku":"10000334","price":32.0,"currency_code":"USD","in_stock":true},{"title":"R01 Milspec","offer_id":45868781633570,"sku":"10000544","price":32.5,"currency_code":"USD","in_stock":true},{"title":"R01 HPA","offer_id":45868781666338,"sku":"10000545","price":34.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/5355\/8050\/files\/ChatGPT_Image_Jun_30_2026_01_18_55_PM_2.png?v=1782850744","url":"https:\/\/www.katechairsoft.com\/products\/polarstar-ugs-stock-rail","provider":"KA Tech Airsoft ","version":"1.0","type":"link"}