New in box Bear Creek Arsenal AR-15 complete upper for sale. Chambered in .223 Wylde. The .223 Wylde offers a chamber that can feed and effectively stabilize a wider variety of ammunition, avoid any pressure-related issues, and maintain both the accuracy of the .223 cartridge and the muzzle velocity of the 5.56. Upper has an 18-inch fluted 416R stainless steel heavy barrel with 1:8 twist. Mid-length gas system, 15 inch M-LOK rail. Includes bolt carrier group and charging handle. Text 985-2zero9-2318.