Grab a high quality 223 Wylde complete upper kit and shoot both 223 Remington and 5.56 NATO from the same AR-15 upper! .223 Wylde was developed to accommodate 223 Remington and the high-pressure military grade 5.56 NATO. Both calibers are widely available and excellent for plinking, self-defense, competitive shooting, or hunting. Our 223 Wylde upper kits have a match grade chamber for high accuracy and include a BCG, rear or side charging upper receiver, 223 Wylde barrel, lower parts kit and stock/blade kit - everything to complete your stripped lower receiver. Find the exact configuration you want from our huge selection of barrel lengths, finishes, flutes, and more. And for completed firearms, check out our huge selection of 223 Wylde ar rifles and pistols ready to shoot out of the box!