A fastener driver includes an outer cylinder having a first end and an opposite, second end, an inner cylinder positioned within the outer cylinder, a moveable piston positioned within the inner cylinder, a driver blade attached to the piston and movable therewith between a top-dead-center position near the second end and a bottom-dead-center position near the first end along a drive axis and a frame that extends from the first end. The frame is integrally formed with the outer cylinder as a single piece