Saw someone used them. He said turn around time was about 3 days! I decided to contact them and very prompt on answering back and quick too! They don't need a complete stripped lower but it would be nice to take whatever easy to take off! Very nice company, I will give them a chance and see! I saw some work on another site and seems like good engraving! They use laser and yes they know NFA requirements.
http://www.graylaser.com
http://www.graylaser.com