The owner of a US company that sells plans to make untraceable 3D printed guns is back in the US after being arrested in Taiwan, where police say he flew after learning he was being investigated for allegedly having sex with an underage girl.
The US Marshals Service say 30-year-old Cody Wilson was booked into Harris County Jail in Houston, Texas, early on Sunday and was being held on $US150,000 ($A200,000) bond.
He was arrested on Friday at a hotel in Taiwan by local police. He is facing sexual assault charges in Austin, according to a statement from the US Marshals service.
Authorities say Wilson met the girl through the website SugardDaddyMeet.com. According to an affidavit, the girl said they met in the parking lot of an Austin coffee shop in August and then drove to a hotel.
The girl told investigators that Wilson paid her $US500 after they had sex and then dropped her off at a Whataburger restaurant.
Wilson is the owner of Austin-based Defense Distributed. Nineteen states and the District of Columbia had sued the Trump administration to dissolve a settlement it reached with the company over allowing it to disseminate its designs for making a 3D-printable gun. The lawsuit by mostly Democratic state attorneys general argued that such weapons could be used by criminals or terrorists.
A federal court last month barred Wilson from posting the designs online for free. He then began selling them for any amount of money to US customers through his website.
Wilson, a self-described "crypto-anarchist", has said "governments should live in fear of their citizenry".
Law enforcement officials worry the guns are easy to conceal and are untraceable since there's no requirement for the firearms to have serial numbers. Gun industry experts have said the printed guns are a modern method of legally assembling a firearm at home without serial numbers.
Australian Associated Press