The Nailgun is one of the 3 starting weapons available in Quake Champions.
In Game Summary
"The Nailgun fires a stream of nails that can eviscerate enemies. While slower than the Machinegun, it also deals greater damage. The nails are projectiles, so remember to lead your target. One of the base starting weapons."
A weaker variant of the Super Nailgun only available through being chosen as a starting weapon. This weapon cannot be dropped from enemies.