In a fastener-driving tool equipped with a fastener magazine, and a power source including a reciprocating driver blade for driving fasteners obtained from the magazine into a workpiece, and a reciprocating valve sleeve actuated by a cage, a nosepiece is provided, including a nosepiece body configured for attachment at one end to the fastener tool and defining a fastener channel constructed and arranged for receiving the driver blade and the fasteners sequentially fed by the magazine, the fastener channel having a fastener outlet. A tubular pin guide is disposed for reciprocal movement in the fastener channel for receiving fasteners traveling toward the outlet. A unitary actuator has a first end engaging the pin guide for common reciprocation relative to the nosepiece body and a second end engaging the cage.