The Null-ray is a sniper rifle.
During the Great War, Null Rays were a common weapon used by Scout and Sniper class Transformers, and were Starscream's preferred weapon. They were sniper rifles fitted with 10x zoom scopes, and the cloaked Scout's best friend.Knock Out began suggesting upgrades to replace the lost limb. His highest recommendation for a new armament was the null ray. Starscream apparently took Knock Out's suggestion as his blaster later disabled Bumblebee with one shot, temporarily shutting him down.