One of the Breech Boresights, the 29-8125 Boresight, performs the alignment of gun tubes without the removal of components. A breech loading style boresight fi tted with handles for 105 MM and 120 MM. The handles allow easy insertion and extraction of the boresight gun. Magnification is 36x. Field of View is 10′ – 1°10′. Minimum Focus is 5½’. Objective Diameter is 1.92″.