What do you have to do to buy a rifle silencer in Texas?

Be 21 yrs old, and not prohibited from buying an ordinary firearm. You will need a dealer in the state of Texas that can transfer the suppressor to you- they can guide you in the paperwork to do that. You will need approval of your local chief law enforcement officer, fingerprints and photos for the background check, $200 for the one time tax on the transfer of the suppressor, and about 5-6 months to wait.