a MK25 host the other day and was very impressed. We ran 158 grain sub-sonic through it and it is very quiet. There was no powder blow back and the gun functioned as it should. Apparently, the lack of blow back is due to the configuration / holes in the blast baffle. One of the other nice features, in my mind, is that Sig uses stainless steel for all of the baffles and not just the blast baffle. For a titanium suppressor, I also thought the price was good at $569.00. If anyone is looking, the SRD9 is worth checking out. Just for the record, I do not work for the LGS or for Sig.