I got into a discussion about what suppressor was being used on the new mk13 , 300 mags. I've been told Surefire , AAC , Ops inc and a custom contracted company.
If youre asking what cans have earned govt contracts specific to the military's req's relative to the MK13 the answer would be more than one. I am 100% certain of one such can being used for that specific rifle - the AAC MK13-SD - but also aware of others being employed on that same rifle but only through word of mouth.