I bought one with my first ti-rant. Went to the Georgia gun club the other day and behind the counter they have a box full of suppressor and threaded barrel accessories that they couldn’t sell, and bam there was a 1/2 x 28 !! Bought it up! There isn’t any more ti rant stuff left but lots of silencer co stuff and thread adapters. I know this doesn’t help but I thought it was a cool find! And I was about to buy one online when I found that one. I know someone has em just can’t remember who.