I want to grab a weapon and shoot

Hi, i have been trying to grab a gun and shoot in my proyect but i cant, im new in programing so i need your help to learn.
Im using the 2018.4.15f1 version of unity, an oculus quest with virtual descktop and the asset oculus integration
Im using a prefab of a gun that i can grab with my hands with the components grabbable and grabber, but i made a script for shooting when i grabb the gun but isnt working, i use this if:
" if ( OVRInput.Get(OVRInput.Button.SecondaryHandTrigger)) "
When grabber is active it isnt working, but if grabber is disabled is working so, anyone knows how to fix it, or to be hable to tell the script that i want to shoot when the weapon is grabbed?