Firearms suppressors were added to regulation in the National Firearms Act of 1934. They are considered a Title II device that is not a firearm. Suppressors work in the exact same way that earmuffs and earplugs work in that they reduce the decibel level of the report of a firearm.
Hollywood movies display suppressors as an attachment that can make a gunshot as quiet as a whisper but in reality a suppressor may take a report of 160 decibels and quiet it to 128 decibels. The reports vary by firearm but are still loud enough to determine that it was a firearm but not loud enough to permanently damage hearing.
We are seeking a resolution to modify the NFA to allow the use of firearms suppressors for the purposes of
1.) Backyard marksmanship
2.) Range shooting
3.) Hunting on private land