{"product_id":"dd-m4a1-fsp-upr-rcvr-14-5-pw-556-fde","title":"Daniel Defense M4A1 FSP Upper Receiver 14.5\" Pinned\/Welded 5.56 NATO – AR-15 Lower (FDE)","description":"\u003cp\u003eThe Daniel Defense M4A1 FSP Upper Receiver delivers a 14.5-inch cold hammer-forged barrel in 5.56 NATO with a permanently attached muzzle device to meet the 16-inch legal requirement. This configuration features a fixed front sight post (FSP) and mil-spec profile, designed to drop onto any mil-spec AR-15 lower receiver. Flat Dark Earth Cerakote finish.\u003c\/p\u003e\u003cp\u003eUpper receiver and barrel extension are CNC-machined from 7075-T6 aluminum with M4 feed ramps. The barrel is chrome-lined with a 1:7 twist rate and M4 profile contour under a mid-length gas system. Comes with BCG, charging handle, and Daniel Defense furniture. No gunsmithing required for installation on a standard AR-15 lower.\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 inches (pinned\/welded to 16\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 7075-T6 aluminum receiver, cold hammer-forged barrel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Flat Dark Earth Cerakote\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e BCG, charging handle, handguard, fixed front sight post\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-in to mil-spec AR-15 lower, no gunsmithing needed\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Daniel Defense","offers":[{"title":"Default Title","offer_id":47937243709695,"sku":"DD23-004-09376","price":1693.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2913825.jpg?v=1766483659","url":"https:\/\/doublestackstore.com\/products\/dd-m4a1-fsp-upr-rcvr-14-5-pw-556-fde","provider":"Double Stack Store","version":"1.0","type":"link"}