Jim,
I have never shot a stock STI 2011 frame, however this one seems to have slightly less recoil than my Deltas. I haven't seen the muzzle blast, I'm sure there is some. The ports on this barrel are fairly large, and seem to keep clean. It helps that the sight is prior to the ports. I have a Glock with a Schuemann ported barrel, I can only see the tritium front sight for the first shot.
The Caspian will have dual top ends, a 5" and 6". Including the Caspian I will have six 10mm's, (Glock 20, 29, and 2 Deltas, 1 Caspian 1911, and 1 STI 1911). There's always hope I'll find a clean Delta Gold Cup or Enhanced model to add along the way.
Here's a pick of the Deltas. The blued Delta is sporting Larry Davidson grips!
