For 5.56 mm carbine
No other part numbers with same form, fit, and function found.
NSN 6150-00-383-4377
NSN 6620-00-209-0767
NSN 6130-01-023-8031
NSN 6610-01-455-0290
NSN 2925-01-009-9560
NSN 5960-01-444-2205
NSN 6220-00-795-7318
NSN 5996-00-984-7641
NSN 6130-01-004-0723
NSN 5945-00-223-1064
NSN 6620-01-246-4314
NSN 5950-01-540-2224