Here is a simple mesh-based tracer actor.
Spawn it at muzzle location of your weapon, set its rotation to forward axis of muzzle, provide hit location, tracer thickness (0.005) and tracer lifetime (0.05)
You can use a simple cylinder mesh and a material with a very high emissive.
OR if you’re lazy, I’ve attached the tracer actor itself. It will probably have broken mesh and material references so you’ll have to use your own mesh and material. The asset requires 4.26 minimum.
LineTrace_Tracer.uasset (147.1 KB)