It's from "The Lost World. Jurassic Park". The character of Richard Schiff describes his rifle. "Lindstradt air rifle. Fires a subsonic Fluger impact delivery dart". This line drives me crazy. Especially "fluger" or "fluger-impact". I couldn't find any definition in the Internet. I think it's a name, but even though it doesn't make any sense to me.
It doesn't mean anything.
Notice that "Fluger" has a capital, indicating it is proper noun. It probably refers to the fictional company that makes the darts.
To give a sense of realism, the author drops these little details in. It gives an impression that his characters have depth. He is showing that Schiff is an expert in guns and darts, since he knows the brand of darts that he is using. It is part of the character development that the author is doing.