{"product_id":"castle-nut-0","title":"Castle Nut","description":"Ergo Castle Nut 4971\u003cbr\u003e\u003cbr\u003eThe castle nut (also known as the stock lock ring and receiver extension nut) is used to secure the buffer tube to the lower receiver.","brand":"Ergo","offers":[{"title":"Default Title","offer_id":7948232458276,"sku":"186974","price":5.49,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1756\/6003\/products\/ergopic4971_4ccf3f96-3d6a-47a5-90e6-ecc577c8d02d.jpg?v=1526408932","url":"https:\/\/optimmerce-integrations.myshopify.com\/products\/castle-nut-0","provider":"Optimmerce Integrations","version":"1.0","type":"link"}