A Class IIIA vest can protect against almost all handgun rounds. IIIA vests (ours included) are tested with bullets up to a .44 Magnum, which is a really powerful round. This vest will protect against smaller rounds as well. We are quite comfortable in saying that a class IIIA vest will protect you from almost any handgun you will ATTRACTIVE PRICE encounter and certainly any handgun that someone conceals. Handgun violence makes up most of the shooting injuries in the World, so this bulletproof vest offers a great level of protection for you.