{"product_id":"spikes-556-upper-14-5pb-rail-dyn","title":"Spike's Tactical 5.56 NATO Upper Receiver Assembly 14.5\" Pinned \u0026 Welded","description":"\u003cp\u003eThis Spike's Tactical complete upper receiver assembly is chambered in 5.56 NATO and features a 14.5-inch barrel with a pinned and welded muzzle device to meet the legal 16-inch minimum barrel length requirement. This configuration allows shooters to achieve a compact carbine-length platform while remaining compliant with NFA regulations. Compatible with mil-spec AR-15 lower receivers.\u003c\/p\u003e\u003cp\u003eThe upper is built with a forged aluminum receiver and includes a free-float handguard for improved accuracy and thermal management. The pinned and welded muzzle device is permanently attached—this upper cannot be disassembled for muzzle device changes without cutting. Barrel material and gas system length are optimized for reliable 5.56 NATO and .223 Remington performance. Ready to install on any mil-spec lower receiver.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 5.56 NATO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Complete Upper Receiver Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lower:\u003c\/strong\u003e Mil-spec AR-15\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Length:\u003c\/strong\u003e 14.5\" (pinned \u0026amp; welded to 16\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged aluminum receiver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandguard:\u003c\/strong\u003e Free-float rail\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Barrel, bolt carrier group configuration varies by model\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-in to mil-spec lower, two takedown pins\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Muzzle device is permanently attached via pinning and welding. Removal requires cutting and may affect legal compliance.\u003c\/p\u003e","brand":"Spike's Tactical","offers":[{"title":"Default Title","offer_id":47938905833727,"sku":"SPKSTU5050-CQ2D","price":905.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2877158.jpg?v=1766536358","url":"https:\/\/doublestackstore.com\/products\/spikes-556-upper-14-5pb-rail-dyn","provider":"Double Stack Store","version":"1.0","type":"link"}