This simple single-shot rifle is highly accurate, but has a long reload time.
— In-game Description

The Longneck Rifle is the first long rifle available to be crafted. The Longneck Rifle can fire either the Simple Rifle Ammo or Tranquilizer Dart. The Tranquilizer Dart cannot be used with attachments. It fires a single shot and has a fairly lengthy reload, making it less effective at close range. It also does 4x the normal damage to any airborne dinos. It is able to be fitted with most attachments, such as the Scope Attachment, Flashlight Attachment, Laser Attachment, and Silencer Attachment.