As differentiated by no special cleaning required
NSN 5920-01-305-5318
NSN 6650-01-576-6512
NSN 5960-01-580-6360
NSN 5920-00-408-4423
NSN 6145-01-212-0907
NSN 5965-01-604-0220
NSN 6620-01-512-2016
NSN 5960-00-752-6175
NSN 6620-00-847-6385
NSN 6220-01-409-1585
NSN 5965-00-829-6884
NSN 6150-01-205-3865