At the recently completed JP Midwest PCC Championship, one Accidental Discharge occurred, attributable to a trigger shoe wider than the trigger guard. The trigger was pressed when the competitor also pressed the magazine release button, causing the gun to fire.
Several aftermarket AR-compatible trigger manufacturers have a plastic trigger shoe mounted on the trigger, which may prove to be problematic for PCC competitors if it extends past the edges of the trigger guard. Rule 5.1.5 of the 2019 USPSA Competition rules unequivocally states: Triggers and/or trigger shoes that extend beyond the width of the trigger guard are expressly prohibited. This rule applies to all divisions. With some PCC lowers, the trigger guard is wide enough to accommodate the trigger with the shoe installed. On many others, the trigger guard is significantly narrower than the trigger shoe. These firearms are considered unsafe guns and the situation must be remedied, usually by simply removing the trigger shoe from the trigger.
Rule 5.1.6 in the Rifle, Shotgun, and Multigun Rules prohibits trigger shoes wider than the trigger guard on handguns, but allows their use in limited circumstances when weather may require “winter” triggers/guards.
Best practice: check your PCC, handgun, rifle, and shotgun. If you have an aftermarket trigger installed, ensure that if there is a trigger shoe, it’s not wider than the trigger guard. If it is, remove it, and you’ll be good to go.