Board Thread:Questions and Answers/@comment-49.144.178.109-20151119010425/@comment-26229461-20151119185603

According to Replica it's because their regulations are too different;Tamakoma First's triggers aren't standardised like Border's normal triggers and are one-off experimental weapons. Kitora and Yoneya's are modified from Border's normal triggers but presumably anyone can modify it that way if they only wanted to.