Designed for frequent use providing professional fastening results in a variety of concrete, masonry or steel applications.The RS22 is a traditional trigger operated the tool. Positive barrel and load retention prevent barrel from opening freely, allowing easy horizontal and overhead fastening.Powder load automatically ejects after each use.Ergonomic design for operator comfort.Heavy-duty all-steel construction.Uses standard .22 caliber single shot powder loads 2 (Brown), 3 (Green), 4 (Yellow) Weight: 4.1 pounds Length: 14-3/4" Muzzle Bushing O.D.: 3/4" Maximum Pin Length: 3"