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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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Barrel Length
  1. 8.5" 1 item
  2. 16" 9 items
  3. 18" 3 items
Caliber
  1. .223/5.56 3 items
  2. .308 1 item
  3. .45 ACP 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 5 items
  6. 7.62x51 2 items
Category
  1. Receiver Parts 45 items
  2. Parts & Kits 16 items
  3. Buffer Systems 5 items
  4. Trigger Parts 3 items
  5. Gas Systems 1 item
  6. Muzzle Devices 3 items
  7. Bolt Parts 9 items
  8. Grips 2 items
  9. Charging Handles 9 items
  10. Rifle Handguards 24 items
  11. Stocks & Braces 2 items
Color
Configuration
  1. AR-15 5 items
  2. M-LOK 5 items
Finish
  1. Arid 1 item
  2. Black 2 items
  3. Cerakote 1 item
  4. Chrome 1 item
  5. FDE 1 item
  6. Nitride 1 item
  7. Phosphate 1 item
  8. Anodize 13 items
Gas System Length
  1. Pistol 2 items
  2. Mid 7 items
  3. Intermediate 3 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.4" 1 item
  4. 1.42" 1 item
Manufacturer
  1. Aero Precision 20 items
  2. Aeroknox 3 items
  3. Angstadt Arms 1 item
  4. Armaspec 1 item
  5. Ballistic Advantage 5 items
  6. Battle Arms Development 8 items
  7. Blitzkrieg Components 1 item
  8. Bootleg 1 item
  9. Bravo Company MFG (BCM) 8 items
  10. Centurion Arms 1 item
  11. Cross Machine Tool (CMT) 5 items
  12. Daniel Defense 1 item
  13. Elftmann Tactical 1 item
  14. Faxon Firearms 2 items
  15. Fortis MFG 2 items
  16. Forward Controls Design 1 item
  17. Geissele 3 items
  18. HERA ARMS 3 items
  19. James Madison Tactical (JMT) 1 item
  20. JP Enterprises Inc 1 item
  21. Knight’s Armament Company (KAC) 2 items
  22. KNS Precision 1 item
  23. Lantac 3 items
  24. Magpul Industries 1 item
  25. Maxim Defense 1 item
  26. Midwest Industries 1 item
  27. NEMO Arms 1 item
  28. Next Level Armament 2 items
  29. Noveske 3 items
  30. Patriot Ordnance Factory (POF) 2 items
  31. Precision Armament 1 item
  32. Primary Weapon Systems 1 item
  33. Radian Weapons 2 items
  34. Rainier Arms, LLC 3 items
  35. Rainier Industries 1 item
  36. Sharps Bros 2 items
  37. Silencerco 2 items
  38. Sionics Weapon Systems 3 items
  39. Sons of Liberty Gun Works 1 item
  40. Stag Arms 1 item
  41. Troy Industries 1 item
  42. Tyrant Designs 1 item
  43. V Seven Weapon Systems 4 items
  44. VLTOR 4 items
  45. WMD Guns 4 items
Mount
  1. KeyMod 7 items
  2. M-LOK 17 items
  3. Picatinny 6 items
Platform
  1. AR-15 4 items
Product Type
  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 3 items
  4. AR-15 Charging Handle 8 items
  5. AR-15 Complete Lower Receiver 8 items
  6. AR-15 Complete Upper Receiver 1 item
  7. AR-15 Handguard 21 items
  8. AR-15 Receiver Set 4 items
  9. AR-15 Stripped Lower Receiver 13 items
  10. AR-15 Stripped Upper Receiver 14 items
  11. Bolt Carrier Group 7 items
  12. Bolt Catch 1 item
  13. Buffer Kit 2 items
  14. Buffer Tube 2 items
  15. Builders Kit 1 item
  16. Cam Pin 1 item
  17. Charging Handle 2 items
  18. Compensator 1 item
  19. End Plate 1 item
  20. Flash Hider 1 item
  21. Forearm Accesory 1 item
  22. Grip Module 1 item
  23. Handguard 3 items
  24. Lower Parts Kit 5 items
  25. Muzzle Brake 1 item
  26. Parts Kit 1 item
  27. Patch 1 item
  28. Safety Selector 2 items
  29. Sight Post 1 item
  30. Silent Captured Spring 1 item
  31. Stock Adapter 1 item
  32. Take Down / Pivot Pins 3 items
  33. Trigger 1 item
  34. Trigger Guard 1 item
  35. Upper Parts Kit 1 item
Rail Length
  1. 4" 1 item
  2. 5.5" 1 item
  3. 6.7" 3 items
  4. 7" 4 items
  5. 9" 2 items
  6. 9.5" 3 items
  7. 9.6" 1 item
  8. 10" 7 items
  9. 10.25" 1 item
  10. 10.5" 1 item
  11. 11.1" 1 item
  12. 12" 8 items
  13. 12.25" 1 item
  14. 12.4" 1 item
  15. 12.5" 1 item
  16. 13" 3 items
  17. 13.5" 1 item
  18. 13.7" 4 items
  19. 13.8" 1 item
  20. 14" 1 item
  21. 15" 15 items
  22. 15.3" 1 item
  23. 17" 1 item
Size
  1. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 (.22 cal) 2 items
  2. 5/8x24 (.30 cal) 1 item
Stock Status
  1. Out of stock 120 items Remove This Item
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