9mm illuminated ammo. Non burning tracer ammo, or "cold" tracer. There is a luminescent coating on the tail end of a regular round, charged momentarily by the flash of the gunpowder. The trace can be seen from pretty much right behind the gun or at a slight angle from behind. Not as bright as traditional tracer rounds, but there is no burning phosphorous to start a fire every time you send one into the foliage.
