{"product_id":"rra-cmplt-mid-a4-upr-450bm-16-5rd","title":"Rra Cmplt Mid A4 Upr 450bm 16\" 5rd","description":"Rock River Arms A4 mid-length upper comes chambered in .450 Bushmaster with a 16\" chrome moly 1\/24 twist barrel. Additionally this upper includes a RRA 13\" M-Lok compatible lightweight free float rail and a RRA Operator Brake (5\/8-32 thread). This is a complete upper with bolt carrier group, charging handle assembly and a 5 round magazine.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures\u003c\/b\u003e :\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e.450 Bushmaster\u003c\/li\u003e\n\u003cli\u003e16 Inch Chrome Moly, 1:24 Twist\u003c\/li\u003e\n\u003cli\u003eRRA Operator Brake, 5\/8-32 Thread\u003c\/li\u003e\n\u003cli\u003eLow Profile Gas Block, Mid-Length Gas System\u003c\/li\u003e\n\u003cli\u003eRRA 13 Inch Extended Lightweight Free Float Rail\u003c\/li\u003e\n\u003cli\u003eBolt Carrier Group, Charging Handle Assembly\u003c\/li\u003e\n\u003cli\u003e(1) Magazine, (5) Rounds\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rock River Arms","offers":[{"title":"Default Title","offer_id":44904349040859,"sku":"RRA450B0592","price":667.86,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/1072\/7131\/files\/RPLRRA450B0592.jpg?v=1718989879","url":"https:\/\/www.atcostammo.com\/products\/rra-cmplt-mid-a4-upr-450bm-16-5rd","provider":"AtCostAmmo.com","version":"1.0","type":"link"}