{"product_id":"aero-m4e1-assembled-upper-black","title":"Aero Precision M4E1 Assembled Upper Receiver – AR-15 Platform","description":"\u003cp\u003eThe Aero Precision M4E1 Assembled Upper Receiver is designed for AR-15 pattern builds in 5.56 NATO\/.223 Remington. Features a forged 7075-T6 aluminum construction with an integrated M4 feed ramp extension and forward assist, compatible with mil-spec AR-15 lowers. The M4E1's enhanced design includes a squared-off upper receiver profile and continuous Picatinny rail, simplifying handguard installation.\u003c\/p\u003e\u003cp\u003eFinished in Type III hard-coat anodized black for corrosion resistance. Upper is fully assembled with ejection port door and forward assist installed. Does not include bolt carrier group, charging handle, or handguard. Requires standard AR-15 barrel nut and handguard to complete assembly. No gunsmithing required for installation on mil-spec lower receivers.\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 Assembled upper receiver (no BCG\/CH)\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\u003eMaterial:\u003c\/strong\u003e Forged 7075-T6 aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Type III hard-coat anodized black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Assembled upper with ejection port door and forward assist\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires barrel, barrel nut, handguard, BCG, and charging handle\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Aero Precision","offers":[{"title":"Default Title","offer_id":47944017641727,"sku":"APAR700201AC","price":159.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2135986.jpg?v=1766612440","url":"https:\/\/doublestackstore.com\/products\/aero-m4e1-assembled-upper-black","provider":"Double Stack Store","version":"1.0","type":"link"}