Rapid Assault Weapon
The Rapid Assault Weapon offers medium rapid fire capability, and can be obtained from a defeated STAR Sentinel. It resembles a rifle.
Rapid Assault Weapon Planet Strike

Rapid Assault Weapon appearance in Planet Strike

It is the only weapon that has a different side-view sprite in Planet Strike.

This is one of only two weapons effective on the ceiling mounted turrets, the other is the Dual-Neutron-Disruptor.

The weapon this most closely resembles from Wolfenstine 3-D and its various mods/ports is the Machine Gun. The machine gun is also a light repeater weapon best used when dealing with crowds of weaker enemies.