{"product_id":"rise-cmplt-uppr-6mm-arc-18-pat-brn","title":"Rise Armament Complete Upper 6mm ARC 18\" – AR-15 Platform","description":"\u003cp\u003eThe Rise Armament Complete Upper delivers 6mm ARC chambering on an AR-15 platform with an 18-inch barrel optimized for extended-range performance. This complete assembly arrives ready to mate with any mil-spec AR-15 lower receiver, offering shooters the ballistic advantages of 6mm ARC—flatter trajectories and superior wind resistance compared to 5.56 NATO—without building a new rifle from scratch.\u003c\/p\u003e\u003cp\u003eConstructed with a forged upper receiver in a Burnt Bronze Cerakote finish, this unit includes a mid-length gas system, bolt carrier group, and charging handle for immediate installation. The 18-inch barrel length provides the velocity needed to maximize the 6mm ARC cartridge's long-range potential while maintaining overall handling balance. No gunsmithing required—install on your existing mil-spec lower and function-check before heading to the range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e 6mm ARC\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 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged aluminum upper receiver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Burnt Bronze Cerakote\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e BCG, charging handle, handguard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Attaches to any mil-spec AR-15 lower receiver\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rise Armament","offers":[{"title":"Default Title","offer_id":47939611951359,"sku":"RISERA-6ARC-CU-BRN-18","price":1006.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/5212443.jpg?v=1766544815","url":"https:\/\/doublestackstore.com\/products\/rise-cmplt-uppr-6mm-arc-18-pat-brn","provider":"Double Stack Store","version":"1.0","type":"link"}