Texas Government Code - GOV'T § 2.052. Not Subject to Federal Regulation

(a) A firearm suppressor that is manufactured in this state and remains in this state is not subject to federal law or federal regulation, including registration, under the authority of the United States Congress to regulate interstate commerce.

(b) A basic material from which a firearm suppressor is manufactured in this state, including unmachined steel, is not a firearm suppressor and is not subject to federal regulation under the authority of the United States Congress to regulate interstate commerce as if it actually were a firearm suppressor.