Quake 1.5 is a darkplaces addon mod for the original Quake. Utilizing Seven's SMC 5.30 as a base, it has been expanded to include new features such as weapons, gore, and plenty of level additions.
The nailgun nails stick in enemies, and the super nailgun is capable of tearing through enemies and nailing body parts to walls
So this is basically Brutal Quake! :D