Used on 105MM and 155MM howitzers. illumination is derived from a radioactive light source (H₃ Gas)

Length 4^1/4 inch
Height 5^3/4 inch
Weight 2 lb
Power 3 X
Field of View 13°20'
Exit Pupil Diameter 0.30 inch
Effective Focal Length
   Objective 4.123 inch
   Eyepiece 1.374 inch