There is a San Antonio criminal defense lawyer that advertises as a FFL on gunbroker.com. I have no idea who he is or whether he is any good, but given his FFL (and NFA class III dealer status) I would suppose he is interested in gun law in particular. Here is the details as given on Gunbroker:
William Davidson Firearms
115 E. Travis #1734 St.
San Antonio, TX 78205
phone: 210-222-2810
fax: 210-222-2041
This appears to be his website:
http://www.williamdavidsonlaw.com/" onclick="window.open(this.href);return false;
You can go to Gunbroker.com, do a search on "Find a FFL Dealer", and plug in a San Antonio zipcode to see what he has there (all gun sales related, not law related).
Again, I am not recommending or not recommending him, only pointing out he came to my attention as a criminal defense attorney with an FFL.
Good luck.