Well in the yanfly melody script that i have for my game whenever I put the gun animation in the notebox he does the same stuff like runs
up to the enemy and uses his gun.

First things first.

1) Is this for a weapon or skill?

2) Can you give me a screencap or post what you have in the notebox?

This is the tag i use for gun weapons.
I simply modified the bow weapon tag that was in a demo

Tag in weapon:
<whole action>
create icon: user, weapon
icon: user, weapon, gun
pose: user, 1h swing reverse
wait 9
icon: user, weapon, recoil
</whole action>

<target action>
attack animation: wait
attack effect: whole
move target: backward, wait
</target action>

<follow action>
delete icon: user, weapon
</follow action>

Hope that helps.