Henry Single Shot Compact Blued Steel 410 Gauge 3in Single Shot Shotgun - 22in - The end of the blued steel barrel is threaded for removable chokes to alter the pattern and range of the shotgun so it can used effectively in a wide variety of hunting. The 410 is threaded for Invector style chokes with a Full choke included in the shotgun out of the box. Additional chokes are widely available at your favorite shooting sports establishment.