Achieving the upper receiver that is 80% complete is an enjoyable and informative experience for gun enthusiasts. It allows you to learn about the workings of firearms, to customize your design, and gain a satisfaction. But, it demands precision, patience and the adherence to the laws. This step-bystep guide will guide you through the steps of finishing an 80percent lower receiver from the beginning of preparation until the final assembly. Understanding the basics A lower receiver with 80% of the weight is a part-machined piece of polymer or metal that requires further machining in order to make functional as a…