New Nailer. At just over 5 pounds and with adjustable depth-of-drive, the Senco SCN49 coil siding nailer accepts wire and plastic collated nails from 1 1/4 to 2 1/2 inches. It has a selectable trigger for both bump-fire and sequential operation and a replaceable no-mar tip. It costs about $350. Senco, 800/543-4596. www.senco.com