I've not had a carry gun magna ported but I have on my hunting revolvers. I had my Smith &Wesson Model 29 ported, re-crowned and the forcing cone recut.
They shortened my Ruger Super Black Hawk's barrell to 4 5/8 inches, re-crowned it and re-cut the forcing cone. Their work was flawless. I'm not sure how much the porting reduces recoil; however, I recover from recoil faster. I reccomend the porting.
Cliffford L. Hughe