Characteristic of all assaultrifles, a selector level allows the shooter to choosebetweenautomatic (continuousfiring) andsemi-automatic (single-shotfiring).
Mr. Pride chose to shoot, firing a singleshot that killed Officer Peter Figoski in the early morning hours of Dec. 12, 2011, prosecutor Kenneth Taub told a jury on the first day of a joint murder trial against Mr. Pride and Michael Valez, the alleged getaway driver that night.
Earlier this week Wilson posted a video online showing a singleshot being fired from "The Liberator, " a plastic handgun that, with the exception of a metal firing pin and a piece of metal included to comply with the Undetectable Firearms Act, was assembled entirely from parts made with a 3-D printer.