Being a guinea pig for a state's rights case sucks. However, the two gentlemen were not sentenced to prison. They are, however, convicted felons.
2 Kansas men spared prison in prosecution over state gun law
WICHITA, Kan. (AP) — A federal judge spared from prison two Kansas men convicted of federal firearms violations after taking into account Monday their mistaken belief that a Kansas law can shield from federal prosecution anyone owning firearms made, sold and kept in the state. The sentence...apnews.com
There is a very big difference in the KS law and the TX law. The KS law stated that the suppressor could be manufactured anywhere but if they were sold and stayed in KS then the NFA rules didn’t apply. The problem is that Congress and the Feds get to control Interstate Commerce. The TX law states that the entire suppressor has to be manufactured in TX and stay in TX. Therefore it would be Intrastate Commerce and the Feds cannot regulate.
It is an interesting tactic and I will be watching to see if it is successful. It is also interesting to read the actual text of the TX and KS laws to see the difference.