AR15 Lower Receivers. Our receivers are manufactured on a CNC milling machine from high tensile strength aircraft grade aluminum billets, using a process that takes over two hours. The end result is nothing short of a perfect billet lower AR15 style receiver that is ready for you to assemble using a mil spec parts kit. The mag well has an extra wide bevel for easier loading of magazines. The rear takedown detent spring is captive with a set screw, so you don’t lose parts when changing stocks, etc… The receivers are hard coat anodized black, Moly Resin finished and are engraved. We have been manufacturing AR10 rifles and lowers since 2009. You will not find a better looking, or higher quality receiver anywhere in the world at any price. Allow 3 days for shipping.