Hi all, I have a question. Shooting subsonic ammo out of my .22 rifle is pretty quiet, quiet enough that I can hear without ear protection the "click" of the hammer, etc... I was thinking about this as a project. Inside the stock the foregrip running down the barrel is completely hollow along with the buttstock, basically the whole plastic stock is hollow. I was thinking about putting some layers of Dynamat (sound deadening material used for cars 40mm thick) along the inside of the stock, and fiberglass filling the buttstock, thinking it is contributing to the sound. You can hear how the hollow stock "echoes" the sound when dry firing. I was also thinking about putting some of this material inside the receiver (There's plenty of room to apply this stuff without touching any of the working parts). I've got the design and plan down, I was just wondering if this could somehow be construed as "silencing" the weapon. I don't want to break any federal laws. Any advice is appreciated. Thank you.