An item having a rim, edge or collar for keeping it in place. it is designed specifically to be used on machine guns and the like.
Classification: Parts and accessories for military rifles of heading 9301
NSN 5999-01-067-9504
NSN 5910-00-469-2249
NSN 6130-01-564-3511
NSN 6145-00-589-1250
NSN 5855-01-618-6370
NSN 5975-00-907-2909
NSN 5930-00-225-5466
NSN 5925-01-341-1729
NSN 5998-01-319-7109
NSN 5930-00-076-0698
NSN 6320-01-271-0247
NSN 6150-01-195-0242