No other part numbers with same form, fit, and function found.
A sighting device consisting of (1) a string and a web belt which is attached to the outside of the muzzle end of the tube, or (2) a disk, with a central peephole, which is inserted in the bore, or (3) a short piece of tubing, with cross lines, which is inserted in the bore of a cannon.
NSN 6130-00-541-8468
NSN 6110-01-327-4572
NSN 5996-01-040-2606
NSN 6320-00-116-3658
NSN 6130-00-631-2309
NSN 6130-01-418-1606
NSN 2925-01-254-3068
NSN 6620-01-595-7459
NSN 6650-00-302-3707
NSN 5960-00-902-0942
NSN 5935-00-171-1801
NSN 4140-01-217-3214