Pulsator

The Pulsator is a Nerf ball blaster that was released in 1998 under the Mega Blitz series.

It comes packaged with six Ballistic Balls.

Details
The Pulsator is a pump-action single-fire ball blaster that was advertised as the "fastest Nerf ball shooter ever". It is fired HAMP-style and lacks a firing trigger. It alternates firing between each of its two large barrels that extend and contract while firing.

Trivia

 * It was featured as a weapon in Nerf Arena Blast.
 * Its barrel style wouldn't be used again until the release of the N-Strike Elite Rhino-Fire.
 * This blaster has become well-known among the Nerfing community for its extremely repetitive commercial.