I recently picked up a R9 that had been customized by Cogan.
It has the chrome slide and frame, checkered front and back strap, and checkering on the front of the trigger guard. The sights were drilled and painted with red dots. The pistol also has Cogan's double porting system.
It is the best looking Rohrbaugh I have ever handled.
It was a nice winter day in Iowa so I took it and another R9 to the range along with my chronograph. I have always wondered how much the porting hurt velocities and how much it helped with recoil.
First, here is the velocities of the two pistols with three different factory loads.
Chronograph tests standard R9 vs Cogan Custom Ported R9
Federal Hydra Shoks, 124 grain - Std R9 - 964 fps, SD - 14 fps
-Ported R9 – 964 fps, SD - 5 fps
Gold Dot 124 grain - Std R9 - 1021 fps, SD – 21 fps
-Ported R9 - 1009 fps, SD – 14 fps
Gold Dot 115 grain -Std R9 - 1062 fps, SD – 12 fps
-Ported R9 - 1062, SD – 18 fps
As you can see, the velocities were nearly identical. Now a before and after porting would be the best test but that was not possible here. I was pleasantly surprised.
As far as noise goes, I was outdoors and I could not tell any difference with muffs on.
As far as recoil reduction, I would guess at about 20% to 30%. This surprised me also and the porting really took the snap out of the 124 grain Gold Dots.
I had no failure with either gun and I must say I am very impressed with the Cogan Gun.