If you want to put together a properly built AR-15 lower receiver but you don’t want to invest in all the specialized tools, SIONICS has your back with their new Gutless Lower Receivers. These receivers come with all the hard stuff already done the right way. The roll pins are installed, the pivot and take down pins are installed, and the receiver extension (buffer tube) is installed and properly staked. That leaves you to customize the easy stuff like fire control parts and the selector.
This is a great idea.