{"product_id":"rock-river-arms-ar-15-a4-complete-upper-458-socom-16in-bull-barrel-15in-m-lok-rail-soc0564","title":"Rock River Arms AR-15 A4 Complete Upper .458 SOCOM 16in Bull Barrel 15in M-LOK Rail SOC0564","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eThe Rock River Arms Tactical Carbine Complete Upper is an A4 flat-top upper receiver assembly chambered in .458 SOCOM, built to deliver hard-hitting performance in an AR-15 compatible platform. It features a 16-inch chrome moly bull barrel with a 1:14 twist, paired with a low-profile gas block and an extended 15-inch RRA lightweight free-float handguard with M-LOK compatibility for modern accessory mounting. This upper comes ready to run with a complete bolt carrier group and charging handle assembly, and it is finished with an RRA Operator muzzle brake threaded 5\/8-32 to help manage recoil.\u003c\/p\u003e\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e.458 SOCOM chambering in an A4 flat-top complete upper receiver assembly\u003c\/li\u003e\n\u003cli\u003e16-inch chrome moly bull barrel with 1:14 twist for dependable performance\u003c\/li\u003e\n\u003cli\u003e15-inch RRA lightweight free-float M-LOK handguard for versatile accessory attachment\u003c\/li\u003e\n\u003cli\u003eIncludes complete bolt carrier group and charging handle assembly for a near drop-in setup\u003c\/li\u003e\n\u003cli\u003eRRA Operator brake with 5\/8-32 thread pitch to help reduce felt recoil\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecs\u003c\/h2\u003e\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 SOC0564\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 842834111916\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlatform Compatibility:\u003c\/strong\u003e AR-15\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpper Receiver Type:\u003c\/strong\u003e A4 \/ Flat-Top\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChambering:\u003c\/strong\u003e .458 SOCOM\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 steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Contour:\u003c\/strong\u003e Bull\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwist Rate:\u003c\/strong\u003e 1:14\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandguard:\u003c\/strong\u003e 15 in RRA lightweight free-float rail, M-LOK compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas Block:\u003c\/strong\u003e Low profile\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 Components:\u003c\/strong\u003e Bolt carrier group; charging handle assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\/Color:\u003c\/strong\u003e Anodized, black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e United States of America\u003c\/li\u003e\n\u003c\/ul\u003e\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":44077365264506,"sku":"FLX-RRASOC0564","price":799.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/283690339.jpg?v=1767668239","url":"https:\/\/tlooutdoors.com\/products\/rock-river-arms-ar-15-a4-complete-upper-458-socom-16in-bull-barrel-15in-m-lok-rail-soc0564","provider":"TLO Outdoors","version":"1.0","type":"link"}