I want that a certain weapon will have a blank reload animation, meaning that when the Reload key is pressed, no animation will play and the clip will be refilled. Is this possible?

Try using a different reload animation. Depending on the weapon, not all relaod anims are used, some are blank. If the weapon you are using has a blank one, you should get no animation to play.

Thanks. I didn't find a blank one, but I found one that was almost perfect.