{"product_id":"castle-nut","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":22112356499535,"sku":"186974","price":5.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0092\/7861\/9727\/products\/GS186974.jpg?v=1555756476","url":"https:\/\/green-supply3.myshopify.com\/products\/castle-nut","provider":"Green Supply3","version":"1.0","type":"link"}