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 6645-01-177-6021
NSN 6610-01-426-5090
NSN 5990-01-014-1280
NSN 6220-00-753-8593
NSN 4140-01-523-6012
NSN 5910-00-221-5060
NSN 5996-01-421-4417
NSN 5998-01-049-9010
NSN 6610-01-357-5957
NSN 6650-00-498-6336
NSN 5910-01-033-9255
NSN 5895-00-421-3648