Grabbing Gun in VR

Hello,
I am making a FPS VR game. I am using the Oculus VR package from the asset store and I added the avatar hands included there. I am able to grab objects, however, when I grab a gun, it does not appear in the correct spot of the hand. I tried using the snap position and orientation feature but still it is not correct when I grab the object from a different angle. How can I achieve this? Or is there another way?
Best regards,
- Jorge Maldonado