most modern weapons today for handguns don't have external safe on them. The glock uses the trigger, more common is a double action semi auto. With that the first round on the trigger pull is about the same as a revolver. Usually 3+ lb pull to discharge the first round. Subsequent rounds are then typical semi-auto pull like half that. The safety is the strength of the trigger pull like on a revolver ... me the glock design is safer but the cocked and locked is the best overall. You can drop that off a building and it will not discharge.