If ARs are already in place it make no sense to also go with a PCC. Range and effectiveness will be reduced and difficulty in training, qualifications, and maintenance will be increased by adding another caliber and operating system into the mix. Different magazines and parts would further complicate things from a logistical standpoint. While I enjoy shooting PCCs and the hit potential is higher than with a service pistol, I believe a patrol rifle should be in a rifle caliber. When an officer deploys a rifle he is either expecting a gunfight or in one. I would never choose to bring a pistol, even a big one like a PCC, to a gunfight if a rifle was available.