You can purchase a silencer in TX.
The following by one of the manufacturers.
Suppressor shipping for buyers that live in Texas
For Texas buyers, you can choose one of the following:
Pick the suppressor up directly from us. In this case, we will work with you to transfer your suppressor and will notify you when it’s ready to pick up.
Have us mail the suppressor directly to you. As with the first option, we will work with you to transfer your suppressor and will notify you when the transfer is complete. Once the transfer is complete, we will mail you a form 4473 that you need to fill out and return (this is the same form you have probably filled out dozens of times when buying firearms, but no additional background check is required). Once we receive the form 4473 from you, we will mail the new suppressor directly to your house at no charge.
Have another Texas dealer handle the transfer. In this case, we will mail the suppressor to the dealer of your choice who will handle the actual transfer process for you. This is basically the same process as buyers who live outside of Texas, so check out the next section for more details.
Of course, those bad boys will follow all of the rules and sign the paperwork, just as they did when they bought (stole) their AR-15.