Under U.S. law, a completed AR-15 lower receiver — even without a barrel, stock, magazine or trigger — is still considered a firearm and requires a serial number. The lower receiver holds the mechanisms that make the rifle fire. Gun manufacturers are circumventing the legislation by selling receivers that are 80 percent complete. A small industry selling the final equipment necessary for people to build their own serial-number-free rifle has emerged. Here is how it works. Read related article
SOURCE: bravoccompanyusa.com, colfaxtactical.com, impactguns.com. GRAPHIC: Alberto Cuadra and Richard Johnson - The Washington Post.