The American Suppressor Association states that 41 states allow some form of legal silencer ownership and use by civilians, as of 2014. Thirteen states have passed Shall Sign/Certify laws that give citizens conditional freedom to manufacture private firearms and firearm accessories, including oil filter silencers.Continue Reading
In states where silencers are legal for private use, non-commercial persons can apply for permission to manufacture firearms and parts via the Bureau of Alcohol, Tobacco, Firearms and Explosives and the person's local law enforcement, using ATF Form 1 (5320.1). This requires the signature of the chief law enforcement official in the jurisdiction. Shall Sign/Certify laws have been passed in several states to reduce the risk of said officers refusing to sign in these instances. These officials and the ATF government page can also help instruct a manufacturer as to what marks are legally required on any part it manufactures.Learn more about Is This Illegal?