dart gun

noun2

1. •
   A gun, typically an air rifle, that fires a dart, usually tipped with a hypodermic needle.

   • The peculiar gun—obviously a dart gun—appeared to be a single-shot device. — 2017
2. •
   A toy gun, usually spring-loaded, that fires a plastic or foam dart.

   • In this lab you will investigate projectile motion with the help of a toy dart gun. — 1990