{"product_id":"rock-river-arms-a4-mid-length-complete-upper-450-bushmaster-16in-1-24-13in-m-lok-450b0592","title":"Rock River Arms A4 Mid-Length Complete Upper .450 Bushmaster 16in 1:24, 13in M-LOK 450B0592","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe Rock River Arms A4 mid-length complete upper receiver is built to deliver hard-hitting performance in .450 Bushmaster while maintaining the handling and modularity of the AR platform. It features a 16-inch chrome moly barrel with a 1:24 twist, a mid-length gas system with a low-profile gas block, and an RRA Operator Brake with 5\/8-32 threads to help manage recoil. A 13-inch M-LOK compatible lightweight free-float rail provides a rigid mounting platform for accessories. This upper arrives ready to install with a bolt carrier group, charging handle assembly, and one 5-round magazine.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eChambered in .450 Bushmaster for powerful hunting and heavy-impact applications\u003c\/li\u003e\n  \u003cli\u003e16-inch chrome moly barrel with 1:24 twist for dependable durability and performance\u003c\/li\u003e\n  \u003cli\u003eMid-length gas system with low-profile gas block for a streamlined build\u003c\/li\u003e\n  \u003cli\u003e13-inch lightweight free-float M-LOK rail for accessory mounting and improved handling\u003c\/li\u003e\n  \u003cli\u003eComplete upper includes bolt carrier group, charging handle assembly, and one 5-round magazine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Rock River Arms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 450B0592\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 842834125548\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlatform:\u003c\/strong\u003e A4 complete upper receiver\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .450 Bushmaster\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrel Length:\u003c\/strong\u003e 16 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBarrel Material:\u003c\/strong\u003e Chrome moly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwist Rate:\u003c\/strong\u003e 1:24\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGas System Length:\u003c\/strong\u003e Mid-length\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGas Block:\u003c\/strong\u003e Low profile\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandguard:\u003c\/strong\u003e RRA 13 in extended lightweight free-float rail (M-LOK compatible)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMuzzle Device:\u003c\/strong\u003e RRA Operator Brake\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMuzzle Threads:\u003c\/strong\u003e 5\/8-32\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Bolt carrier group, charging handle assembly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagazine Included:\u003c\/strong\u003e 1 magazine\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMagazine Capacity:\u003c\/strong\u003e 5 rounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product’s manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"Rock River Arms","offers":[{"title":"Default Title","offer_id":44077315457146,"sku":"FLX-RRA450B0592","price":762.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/283690031.jpg?v=1767662753","url":"https:\/\/tlooutdoors.com\/products\/rock-river-arms-a4-mid-length-complete-upper-450-bushmaster-16in-1-24-13in-m-lok-450b0592","provider":"TLO Outdoors","version":"1.0","type":"link"}