Synchronized animation with ranged attacks

Hello everyone! I have an error synchronizing an attack with animation. I have a mob that fires a ranged attack, only the projectile flies out first and then the animation occurs. I need the mob to first produce animation and then the bullet flies out, but I don’t know how to do it. I tried many procedures but they didn’t help me. There is a tutorial on YouTube but it is too difficult for me (I don’t know English well) but if you post the procedure from that tutorial on YouTube it will also be a very good help. I hope someone can help me because that I really want to make this mod and I’m really looking for all the solutions to the problem