Jrd458

Hi, i'm fairly new to gun mods and was wondering what the best way to go about quieting my rifle would be. I have an army raptor 7" RIS AUG. I know that due to it being a bullpup it naturally louder with the motor next to my ear how ever i want to know a way to make the wind up of the motor quieter i've seen people use foam inside the stock and changing the gears but i would like help for the best way to go about this. Many Thanks.