So I just picked up an STS at Cabelas in the bargain cave and threw it on the Guardian. Unbelievable!! It makes the same sound as the 9 mm with a silencer Jack Bauer uses on 24 :biggrin1: :biggrin1: , but quiter. Just for kicks, I got out my old PSE Fire Flite I bought 3 years ago when I was getting into archery and shot it. It sounded like a canon in comparison. Just when I thought the Guard couldn't get quieter, the STS took it up a notch. Pretty cool. And, no, I do not work for Bowtech or the makers of the STS, whoever they are.