The Lindstradt air rifle is a fictional rifle made in Sweden, used in Michael Crichton's novel The Lost World, and in the novel's film adaptation The Lost World: Jurassic Park directed by Steven Spielberg. In both the book and the movie, the rifle is used by Eddie Carr, played by Richard Schiff in the film, as well as Sarah Harding, played by Julianne Moore, in the end of the film. Solely in the novel, however, the rifle is also used by Kelly Curtis, Dr. Thorne, and Richard Levine.
The Lindstradt rifle is a weapon that uses a canister of carbon dioxide (CO2) to propel a subsonic flugar-impact delivery dart that can contain any liquid substance, whether it be blood, poison, venom, a tranquilizing sedative, a pathogen, or nothing except air, so as to deliver an air bubble into the blood stream of a living target.