About 20 years ago, when "Race Guns" hadn't really gotten going in IPSC, several of us played around with various types of ported barrels. I think I still have a gizzie which is built onto the barrel bushing. Natcherly, ya gotta see what kind of night-time lightshow the dang thing makes.
Bummer. But, I'd kinda forgotten until this discussion.
One DOES appreciate a ported barrel on a Raging Bull--which is not exactly a bedside-table gun.