An apparatus (10) for driving fasteners including a cylinder (12), a driving piston (14) arranged for driving a fastener from the apparatus (10) into a substrate, the piston (14) being arranged for reciprocating movement relative to the cylinder (12), a charge supply for feeding a charge to a combustion chamber of the cylinder (12) where the charge is combusted to drive movement of the piston (14) relative to the cylinder (12), a coil feed (16) of fasteners, and a guidance system (18) configured to guide the apparatus (10) relative to the substrate, the guidance system (18) including a positive placement system (20).