Buy Lower Receivers Rifles Online Lower receivers are part of the weapon that houses the triggers and magazines well. If you want to buy lower receivers of rifles online, we have a wide selection that you can choose from. We ensure that each aspect of this AR lower is made to meet mil-spec requirements, offering optimal fit on your next build. These can be found in various colors and finishes based on your needs. Read more : https://www.quora.com/profile/Second-Amendment-LLC