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 4140-00-078-9357
NSN 5930-00-010-6617
NSN 5990-00-206-3753
NSN 5999-01-068-8749
NSN 6650-01-333-7918
NSN 5905-01-496-9555
NSN 5998-01-596-9268
NSN 4140-01-582-9725
NSN 5960-01-224-3850
NSN 5910-00-250-3969
NSN 6110-00-141-1966
NSN 5960-01-252-8821