The year I shot PCC in USPSA, I found that the carbine helped my eye speed with pistols. Since then, I have shot Carry Optics in USPSA and the PCC just occasionally as a second gun in Steel Challenge. With 9mm so scarce in 2020, my PCC shooting has pretty much ceased.
Another forum member, Talionis, just told me that he believes that regular shooting with a Tippman .22 AR was behind an excellent finish in CO at a USPSA area match this year. I decided to try incorporating a .22 AR into regular USPSA pistol practice sessions, to improve eye speed and help maintain carbine proficiency. The plan is to arrive with four loaded 25 round magazines, and shoot them some time during my pistol session. Will try this for a month or so and then evaluate whether to continue.