That rocks. I reckon +P HST would still be subsonic, and with that long barrel to expand gas in, should be stupid quiet. People who hunt whitetails with a can describe them basically just standing there wondering what bit them until they fall over...
How do you like that poly butt stock? Looks like you have extra LOP in the leather pad.
What's your all-up weight and OAL? (Without can, I guess...)
Does the barrel have six lands the same width as the grooves (typical of factory T/C .45 Auto barrels), or a more "normal" bore configuration?