Here's my SBR PS90 with Gemtech. I've not had any problems so far. The only thing that sucks is that you have to have something equal to welding gloves to take it off after a 50 magazine thru it, it gets HOT!! I'm using SS197 in it, so you can still hear the sonic pop and also the clang from the steel. I really should have shot it at the dirt so you could hear the weapon better. I'll try to get some better video as long as the weather holds. It was also pretty windy, so you can't hear me say that "This is a PS90, with Gemtech suppressor"