How to Add Manufacturer Home › Forums › General › Site Help and Support › How to Add Manufacturer This topic contains 0 replies, has 1 voice, and was last updated by melloyello 11 months, 1 week ago. Author Posts 20180312 at 5:08 pm #86867 melloyelloParticipant Posts: 2 Join Date: 01/06/2016 I was looking for information on OSS suppressors and noticed they are not listed in the forum. They are listed in the NFA tracker though. How are NFA Manufactures added? Author Posts You must be logged in to reply to this topic.