I haven't asked Tom yet, but Robert Chombart (inventor of the trigger) has a post up on accurate shooter that the CG trigger will no longer be licensed to X Treme shooting as a supplier. I don't know how this affects the mk13 trigger, but I was suspect that if you want one you better call and see if he has enough parts to make you one before it's too late. Still a new development, so no info on who will be making triggers now and where (US or overseas).
http://forum.accurateshooter.com/threads/x-treme-trigger.3930259/
http://forum.accurateshooter.com/threads/x-treme-trigger.3930259/