Hi Tom. It's Greyson's Guns in Orange. I've bought my three guns from there. Great people and nice store. Anyway, I asked one of the staff members if it's illegal and he said it shouldn't be a problem at all. He went upstairs to confirm it with another worker and they said the same. I was looking at purchasing it from Tacticool22 where it literally says it's a "non-threaded" barrel. Please let me know if you find anything as well. Thanks.