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 6620-01-557-6512
NSN 5965-01-080-9808
NSN 5985-01-424-6449
NSN 6645-00-067-9517
NSN 6320-00-731-6134
NSN 5930-00-360-6533
NSN 6135-01-519-7879
NSN 6620-00-581-8984
NSN 2925-00-720-3948
NSN 5999-01-334-1225
NSN 5965-00-188-5531
NSN 5999-01-502-1489