viper8310. welcome to the forum from the southwest corner of Indiana.
I guess the first question, should be do you mean plated bronze, or something like cera-kote?
The second question would address the want for porting of the slide... would this also include the barrel, as was displayed here recently, with the Mag-Na-Port process? As sigsrok advised, this will more than likely void the warranty. If you are wanting to dampen recoil, or arrest muzzle flip, there are other ways besides porting the barrel and slide.
Since you are inquiring about the Carry model, you could utilize one of the longer barrels, have it threaded, and install a removable compensator or muzzle brake, to attach just as you would for a sound suppressor. That way you wouldn't influence the integrity of the slide or barrel.