Parts List

 This is a top down list of the parts needed to complete a flat top AR15 build. This is a list of the basic parts needed. If you are building a piston upper then you will not need some of the parts listed. Most piston conversion kits will come with the parts needed and instructions for installation. I have tried to make the list as accurate as possible with a break down of every part section. I listed all the parts for sections that can be purchased as kits not assembled. Parts in bold have a further breakdown and are marked.

Main Body:

  1. Lower Receiver
  2. Upper Receiver


Upper Receiver Parts:
  1. Barrel
  2. Barrel Nut
  3. Bolt Carrier Group #
  4. Charging Handle
  5. Delta Ring
  6. Delta Ring Retainer
  7. Delta Spring
  8. Ejection Port Cover
  9. Ejection Port Cover Pin
  10. Ejection Port Cover Retaining Ring
  11. Ejection Port Cover Spring
  12. Flash Suppressor/Compensator
  13. Forward Assist Assembly *
  14. Forward Assist Pin
  15. Forward Assist Spring
  16. Gas/Piston Block 
  17. Gas/Piston Block Retaining Pins or Screws
  18. Gas Tube/Drive Rod
  19. Gas Tube Retaining Pin/Plug
  20. Handguard
  21. Peel or Crush Washer

# Bolt Carrier Group:
  1. Bolt +
  2. Bolt Cam Pin
  3. Bolt Carrier
  4. Firing Pin
  5. Firing Pin Retaining Pin

+ Bolt:

  1. Bolt
  2. Bolt Rings
  3. Ejector
  4. Ejector Pin
  5. Ejector Spring
  6. Extractor
  7. Extractor Pin
  8. Extractor Spring

* Forward Assist Assembly:

  1. Forward Assist Pawl
  2. Forward Assist Pawl Compression Spring
  3. Forward Assist Pawl Detent
  4. Forward Assist Pawl Retaining Pin
  5. Forward Assist Plunger 

Buffer Tube Parts List:
  1. Buffer
  2. Buffer Castle Nut or Self Locking Screw
  3. Buffer Plate
  4. Buffer Spring
  5. Buffer Tube
  6. Collapsible or Solid Buttstock Assembly

Lower Parts Kit List:
  1. Bolt Catch
  2. Bolt Catch Spring
  3. Bolt Catch Plunger
  4. Bolt Catch Retaining Pin
  5. Buffer Retainer
  6. Buffer Retainer Spring
  7. Disconnector
  8. Disconnector Spring
  9. Grip
  10. Grip Lock Washer
  11. Grip Machine Screw
  12. Hammer
  13. Hammer Pin
  14. Hammer Spring
  15. Magazine Catch
  16. Magazine Catch Button
  17. Magazine Catch Spring
  18. Pivot Pin
  19. Pivot Pin Detent
  20. Pivot Pin Detent Spring
  21. Safety Detent
  22. Safety Detent Spring
  23. Safety Lever
  24. Takedown Pin
  25. Takedown Pin Detent
  26. Takedown Pin Detent Spring
  27. Trigger
  28. Trigger Pin
  29. Trigger Spring
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