I wanted to look into this properly because I felt like I must be missing something. I do not understand why you would want to combine a mod that turns bullets into actual projectiles with a mod that shows you where guns are firing, you can see where they're going by looking at them, no?
The tracers are cosmetic beam explosions between source and destination. They're implemented in such a way that they start the 5 frame long beam explosion animation when the shot hits something.
I could change that but to what? To trigger the explosion earlier? It would still look weird to have a random beam that simulates a projectile be almost instantaneous before, after or during the flight of the actual bullet projectile.
It seems to work exactly as it should! Maybe you could tell me what you're hoping for? The only part I can see that might be worth changing from my end is the offset of 0.3 that's built into Bullet Trails, making the beam not line up, especially at short ranges. I'm open to suggestions!