Parts Diagrams
Upper Receiver
| Part Description | Colt Part | Bushmaster Part |
|---|---|---|
| (1) Upper Receiver | 64512 | 9349063 |
| (2) Forward Assist Spring Pin | 95126 | MS16562-103 |
| (3) Rear Sight Elevation Spring Pin | 64520 | MS16562-121 |
| (4) Pawl Detent | 62268 | 8448544 |
| (5) Pawl Spring | 50381 | 8448542 |
| (6) Forward Assist Plunger | 64531 | 9349085 |
| (7) Pawl Spring Pin | 95127 | MS16562-103 |
| (8) Forward Assist Pawl | 62269 | 8448543 |
| (9) Forward Assist Spring | 62271 | 8448540 |
| (10) E-ring - Ejection Port Pin | 90402 | MS16632-1012 |
| (11) Ejection Port Cover Pin | 61658 | 8448533 |
| (12) Ejection Port Cover Spring | 61518 | 8448532 |
| (13) Ejection Port Cover | 64535 | 8448525 |
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