Building a custom firearm is an exciting project that lets you mix great engineering with your own personal style. Whether you are new to building guns or have done it before, choosing the right parts is very important. Two key components that can really improve your build are the ar10 lower receiver and the 308 upper. These parts offer strong performance, reliability, and versatility, making them a great choice for many different shooting needs. Building a custom firearm is an exciting project that lets you mix great engineering with your own personal style. Whether you are new to building guns or have done it before, choosing the right parts is very important. Two key components that can really improve your build are the ar10 lower receiver and the 308 upper. These parts offer strong performance, reliability, and versatility, making them a great choice for many different shooting needs.