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Are you ready to take your AR-15 build to the next level? Assembling your custom AR upper can be a rewarding and educational experience. In this step-by-step guide, we'll walk you through the entire process of how to build an AR 15 upper assembly, from selecting the right components to putting it all together. Whether you're working with an FDE complete upper, a standard AR upper, or an AR-15 pistol upper kit, understanding the upper receiver and its parts is crucial. We'll cover the AR-15 upper …