Quick overview of the differences between a full auto M16 lower compared to the semi-auto (only) AR-15 lower, which in this video is a 3D printed Defense Distributed ABS lower printed on a Stratasys Dimension SST. Note the AR-15 lower does not have a serial number, as I printed it for my own personal use before I received my FFL, and thus does not require maker's marks (per the Gun Control Act (GCA) of 1968, 18 U.S.C. Chapter 44, which allows an unlicensed individual to make a title I firearm for personal use, but not for sale or distribution.

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