Although not in my possession, I am now the proud owner of a 9MM Suppressor for my G-19 and some day an SBR chambered in 9MM. AAC said the model would fit on a carbine with a spacer and could handle a Slidefire stock. The shop I went to has to hold it, but said I can use it at the range while I wait for the Feds to do the paperwork; obviously it can not leave the premises.
Paperwork was easy and the shop was great and knowledgeable so overall it was a great experience. Would very much recommend an NFA trust.