UPPER RECEIVER AND BARREL ASSEMBLY
1. Upper Receiver
2. Hand Guards
3. Gas Tube
4. Barrel
5. Crush Washer/ Peel Washer / Lock Washer
6. Compensator: A1 / A2 / 5.5in / Vortex
7. Gas Tube Roll Pin
8. Hand Guard Slip Ring
9. Hand Guard Slip Ring Spring
10. Retaining Ring
A2 REAR SIGHT ASSEMBLY
1. Rear Sight Base Windage Knob Roll Pin
2. Rear Sight Base
3. Rear Sight Base Windage Knob Screw
4. Rear Sight Base Spring
5. Rear Sight Base Ball Bearing
6. Rear Sight Base A2 Aperture
7. Rear Sight Base Flat Spring A2
8. Rear Sight Base Windage Knob
UPPER RECEIVER ASSEMBLY
1. Rear Sight Base Index Elevation 8/3
2. Rear Sight Base Index Screw
3. Rear Sight Assembly
4. Rear Sight Ball Bearing
5. Rear Sight Spring
6. Upper Receiver
7. Ejection Port Cover Pin Snap Ring
8. Ejection Port Cover Pin
9. Ejection Port Cover
10. Ejection Port Cover Spring
11. Forward Assist Roll Pin
12. Rear Sight Base Roll Pin
13. Forward Assist Spring
14. Forward Assist / Round
15. Rear Sight Base Elevation Knob Spring
16. Rear Sight Base Elevation Knob
BOLT ASSEMBLY
1. Gas Rings
2. Bolt
3. Extractor Pin
4. Ejector Roll Pin
5. Ejector Spring
6. Ejector
7. Extractor
8. Extractor Spring
9. Extractor Spring Insert
BOLT AND BOLT CARRIER ASSEMBLY
1. Firing Pin
2. Firing Pin Retaining Pin
3. Cam Pin
4. Bolt Assembly
5. Bolt Carrier
CARRYING HANDLE ASSEMBLY
1. Rear Sight Assembly
2. Rear Sight Base Index Screw
3. Rear Sight Base Index Elevation M4 600m
4. Rear Sight Base Elevation Knob
5. Rear Sight Base Elevation Knob Spring
6. Rear Sight Ball Bearing
7. Rear Sight Spring
8. Rear Sight Base Roll Pin
9. Carrying Handle Nut
10. Carrying Handle Mounting Bracket
11. Carrying Handle
CHARGING HANDLE ASSEMBLY
1. Charging Handle Latch Roll Pin
2. Charging Handle Latch
3. Charging Handle Latch Spring
4. Charging Handle
FORWARD ASSIST ASSEMBLY
1. Forward Assist Plunger
2. Forward Assist Pawl Roll Pin
3. Forward Assist Pawl Spring
4. Forward Assist Pawl Detent
5. Forward Assist Pawl
KEY AND BOLT CARRIER ASSEMBLY
1. Bolt Carrier Key Screw
2. Bolt Carrier Key
3. Bolt Carrier
A2 BUTTSTOCK ASSEMBLY
1. A2 Buttstock Door Assembly
2. A2 Buttstock Plate
3. A2 Buttstock Hinge
4. A2 Buttstock
5. A2 Buttstock Rear Swivel
6. A2 Buttstock Hinge Pin
7. A2 Buttstock Lower Screw