My particle has a delay after saying completed

Hello! So I am having trouble with my bullet eject particles. Whenever the particle says “completed” there is always a startup delay that is like a second long. I have checked and all seats including warmup delay is set to 0! Thank you.

So I just realized if I set my spawn rate to a high number it spawns immediately, but it spawns too many particles. I just want one mesh.

You need to use a burst instead of a spawn rate in order to get particles spawned instantly.
set your spawn rate to 0 and scroll a litle bit under the spawn rate section, you will see the “burst” section. Add an item in the “burst List” and set the count to 1. By default the time is set to 0 which will spawn a single particle as soon as the emitter is activated.
Cheers!