Rise Armament RA6ARCCUBRN18 Upper Receiver 6 ARC 18" Black Cerakote Barrel Aluminum
http://www.tandktactical.com/shop/850043415954-rise-armament-ra6arccubrn18-upper-receiver-6-arc-18-black-cerakote-barrel-aluminum-51434
http://www.tandktactical.com/web/image/product.template/51434/image_1920?unique=dbc7e07
The RISE 6mm ARC AR-15 Upper Receivers features an exceptionally accurate 18-inch 416R stainless steel threaded barrel.
