The write up Rick did showed holes not centered, ugly/incomplete welds, splatter everywhere, a hole drilled/tapped sideways, basically poor craftsmanship. A Diamond is twice as much so that means that this is a CZ version
Others said that there's were not as nasty as his, but good or bad, TG is just the low buck dealer. Take that as you want.
Its stronger than the thin stock housings, but not worth $400 plus shipping to me.