{"product_id":"fx-stx-liner","title":"FX Airguns STX Superior Barrel Liners","description":"\u003cp\u003eGenuine FX Smooth Twist X (STX) barrel liner — the factory-standard liner system used across FX Impact, Wildcat, Dreamline, and Crown platforms. FX rifles the liner using its patented outside-in pressing process, producing tight bore tolerances and consistent shot-to-shot performance for pellets and slugs.\u003c\/p\u003e\n\u003cp\u003eDrop-in replacement for existing FX STX barrel kits — supplied as liner only (no barrel kit included). Select your caliber, barrel length, and twist rate below.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNote: FX has revised twist rates across production runs over the years. Twist rates listed here reflect current factory-standard specs; confirm against your specific barrel kit generation if precision slug work is critical.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cem\u003eTo find the twist rate of your desired liner, please \u003ca href=\"https:\/\/www.fxairguns.com\/accessories\/barrels\/liners\/\" title=\"FX Airguns Liners\"\u003eCLICK HERE\u003c\/a\u003e to go to the FX website interactive liner menu!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/h3\u003e","brand":"FX Airguns","offers":[{"title":".177 \/ 300mm \/ Standard","offer_id":47267099803817,"sku":"20362","price":99.99,"currency_code":"USD","in_stock":false},{"title":".177 \/ 380mm \/ Standard","offer_id":47267099869353,"sku":"20187","price":99.99,"currency_code":"USD","in_stock":false},{"title":".177 \/ 500mm \/ Standard","offer_id":47267099934889,"sku":"19964","price":99.99,"currency_code":"USD","in_stock":false},{"title":".177 \/ 500mm \/ 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