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 5999-01-557-0172
NSN 6320-01-481-7322
NSN 6685-00-497-7002
NSN 5925-01-218-6427
NSN 7035-01-456-8149
NSN 5835-01-584-8538
NSN 6685-01-140-6604
NSN 6645-01-366-4344
NSN 5985-01-256-1022
NSN 6135-00-284-1406
NSN 5920-00-140-8912
NSN 6645-01-620-4837