Surface treatment is per mil-p-16232, type m, class 1
Classification: Parts and accessories for military rifles of heading 9301
NSN 6685-00-327-6401
NSN 5835-01-332-2867
NSN 6110-01-138-9916
NSN 5915-01-084-1883
NSN 5935-01-412-5296
NSN 6610-01-555-8364
NSN 5999-01-056-5281
NSN 6145-01-634-0388
NSN 6320-01-449-1014
NSN 5935-00-348-6621
NSN 6240-00-822-4571
NSN 5975-01-391-6479