{"product_id":"aero-complete-upper-5-56-20-a2-blk","title":"Aero Precision Complete Upper 5.56 NATO 20\" A2 Profile – AR-15 Platform","description":"\u003cp\u003eThis Aero Precision complete upper assembly delivers classic A2 configuration in 5.56 NATO, built around a 20-inch government profile barrel. Chambered for 5.56 NATO (accepts .223 Remington), this upper fits standard mil-spec AR-15 lower receivers and ships ready to install. The longer barrel length maximizes velocity and effective range for precision shooting and longer-distance applications.\u003c\/p\u003e\u003cp\u003eConstructed from 7075-T6 aluminum with a black anodized finish, this upper includes a complete bolt carrier group and charging handle. The A2 profile barrel features a 1:7 twist rate for stabilizing heavier projectiles. Installation requires basic familiarity with AR-15 platform assembly—torque specs and proper headspacing verification recommended.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 5.56 NATO \/ .223 Remington\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Complete Upper 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 20 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel Profile:\u003c\/strong\u003e Government A2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwist Rate:\u003c\/strong\u003e 1:7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 7075-T6 Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black Anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Bolt Carrier Group, Charging Handle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires mil-spec AR-15 lower receiver, basic assembly knowledge\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Aero Precision","offers":[{"title":"Default Title","offer_id":47944017248511,"sku":"APAR505611","price":565.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2854401.jpg?v=1766612388","url":"https:\/\/doublestackstore.com\/products\/aero-complete-upper-5-56-20-a2-blk","provider":"Double Stack Store","version":"1.0","type":"link"}