The AR-15 is one of the most popular rifles in the United States and a favorite among gun enthusiasts and first-time shooters alike. But when it comes to building the perfect AR-15, you want only the best parts that are made right here in the United States. Finding the right AR 15 parts to build the perfect rifle can be a daunting task, but this guide will provide you with all the information you need to make the perfect selection of American-made AR-15 parts for your rifle. Upper Receiver The upper receiver of an AR-15 is the most important part…