Nyarf

 guns are dart guns used by Wendy Corduroy, and Dipper and Mabel Pines in Dreamscaperers.

History
They are first seen and used when Wendy and the Pines family is watching Grandpa the Kid. Wendy dully shoots one at Dipper and misses, and Dipper does the same. Later, Stan asks Dipper to get rid of a bat in the kitchen, and Dipper is hurt in the process. After Mabel and Soos take care of his injuries, Stan yells at him to unclog to sink, and out of anger, Dipper shoots a dart at his picture. Even later, after Bill Cipher finds the door containing a memory of Stan, Mabel uses the gun to shoot the door out of Bill's hand, and into the Bottomless pit.

Appearance
Nyarf looks like an average dart gun. It has "Nyarf" written on both sides. It is colored green and orange, and the trigger is blue. It has a hole in the front where the dart shoots out of.