Well, I'm happy to say that I've bought 2 suppressors from Dan (MeanV) and the first one works perfectly and the second one I had to return because I gave the wrong measurements and it did not fit. I called Dan and he said I could return it and get a refund. I was never called a "dumb ass" even though it was my error. BTW, the reports about STS have been more negative than positive i.e. the stopper blowing off as well as other string silencers.