Alright so a friend of mine built a suppressor for a paintball gun that was quite impressive. I play tournaments from time to time and id like to built one myself but I want to make sure that its not illegal first. The basic build of it is you take an old barrel drill holes in patterns down it then set up you baffle system and cover it in pvc. I know paintball guns are not considers firearms and there is no way i could attach this to a real rifle if I do it. So before I build it and get smaked with a fee and jail time is it illegal?