The Sawtooth Pulse is a good beginner weapon. Although its projectiles are small, it has a decent RPM and damage. It is unlocked at level 1, and is recommended over the Massacre, of the same price and power. Its projectiles are a bright blue color.
"A triple redundant magnetic acceleration node launches a five-inch kinetic rod at relativistic speed, heating the air to a light blue. Even slowed by the atmosphere, the projectiles are as beautiful as they are deadly."