Models View all M4A1 - Bolt Carrier - Bolt - Enlarged Extractor with no Locking lug 26 779 0 M4A1 - Bolt Carrier - Bolt - Bolt(with no extractor cut) 27 1058 3 M16 trigger 71 3330 4 M4A1 - Bolt Carrier - Bolt Carrier - Firing Pin1 15 705 0 M4A1 - Bolt Carrier - Bolt - Extractor1 15 700 0 M4A1 - Bolt Carrier - Bolt Carrier- Bolt Cam Pin 18 752 5