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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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  1. Option AR-15 Remove This Item
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Barrel Length
  1. 7" 3 items
  2. 8.5" 1 item
  3. 10.3" 3 items
  4. 16" 7 items
  5. 16.1" 1 item
  6. 18" 7 items
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Rem 1 item
  3. .223 Wylde 1 item
  4. .308 1 item
  5. 300 Blackout 1 item
  6. 5.56 NATO 4 items
  7. 5.56mm 1 item
  8. 6.8 SPC 1 item
  9. 7.62x51 1 item
  10. 9mm 2 items
Category
  1. Receiver Parts 50 items
  2. Parts & Kits 20 items
  3. Buffer Systems 7 items
  4. Trigger Parts 2 items
  5. Muzzle Devices 6 items
  6. Bolt Parts 7 items
  7. Grips 1 item
  8. Charging Handles 17 items
  9. Rifle Handguards 39 items
  10. Stocks & Braces 5 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 8 items
  3. M-LOK 3 items
  4. Rifle 1 item
  5. Right Hand 1 item
Finish
  1. Black 3 items
  2. Carbon Fiber 1 item
  3. DLC 1 item
  4. Phosphate 1 item
  5. Anodize 7 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol 4 items
  2. Mid 7 items
  3. Intermediate 7 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.08" 1 item
  2. 1.15" 1 item
  3. 1.3" 2 items
  4. 1.315" 1 item
  5. 1.34" 3 items
  6. 1.385" 1 item
  7. 1.4" 1 item
  8. 1.54" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. Aero Precision 3 items
  2. Airborne Arms 1 item
  3. Andro Corp Industries 4 items
  4. Arms Republic 2 items
  5. Blitzkrieg Components 7 items
  6. Bootleg 1 item
  7. Bravo Company MFG (BCM) 9 items
  8. Brigand Arms 1 item
  9. Centurion Arms 9 items
  10. Cross Machine Tool (CMT) 2 items
  11. Daniel Defense 4 items
  12. DPM Systems Technologies 1 item
  13. F-1 Firearms 1 item
  14. Fortis MFG 15 items
  15. Forward Controls Design 10 items
  16. FosTecH 1 item
  17. Geissele 6 items
  18. Grey Ghost Precision 1 item
  19. Griffin Armament 5 items
  20. Half Cocked Arms (HCA) 1 item
  21. HERA ARMS 3 items
  22. Icarus Precision 1 item
  23. JL Billet 4 items
  24. JP Enterprises Inc 7 items
  25. KNS Precision 3 items
  26. Lantac 1 item
  27. Lewis Machine & Tool (LMT) 1 item
  28. Magpul Industries 4 items
  29. Maxim Defense 3 items
  30. Next Level Armament 2 items
  31. Noveske 6 items
  32. Patriot Ordnance Factory (POF) 2 items
  33. Precision Armament 1 item
  34. Primary Weapon Systems 2 items
  35. Radian Weapons 4 items
  36. Rainier Arms, LLC 3 items
  37. Rainier Industries 3 items
  38. Rise Armament 1 item
  39. RogueOps 3 items
  40. Sharps Bros 6 items
  41. Silencerco 1 item
  42. Sons of Liberty Gun Works 4 items
  43. Strike Industries 2 items
  44. Tactical Edge Arms 1 item
  45. Timney Triggers 1 item
  46. Tyrant Designs 1 item
  47. Underground Tactical 1 item
  48. V Seven Weapon Systems 4 items
  49. VLTOR 4 items
Mount
  1. KeyMod 6 items
  2. M-LOK 24 items
  3. Picatinny 17 items
Platform
  1. AR-15 11 items
Product Type
  1. AR-15 Assembled Upper Receiver 3 items
  2. AR-15 Charging Handle 15 items
  3. AR-15 Complete Lower Receiver 5 items
  4. AR-15 Complete Upper Receiver 4 items
  5. AR-15 Partial Upper Receiver 1 item
  6. AR-15 Handguard 35 items
  7. AR-15 Receiver Set 5 items
  8. AR-15 Stripped Lower Receiver 17 items
  9. AR-15 Stripped Upper Receiver 14 items
  10. Bolt 1 item
  11. Bolt Carrier Group 6 items
  12. Bolt Catch 4 items
  13. Brace 1 item
  14. Buffer 1 item
  15. Buffer Kit 3 items
  16. Buffer Spring 1 item
  17. Buffer Tube 1 item
  18. Cam Pin 1 item
  19. Castle Nut / End Plate 2 items
  20. Charging Handle 6 items
  21. Chassis 1 item
  22. Complete Upper 1 item
  23. Dust Cover 3 items
  24. Flash Hider 4 items
  25. Forearm Accesory 2 items
  26. Front Sight 1 item
  27. Handguard 7 items
  28. Lower Parts Kit 5 items
  29. Magazine 1 item
  30. Muzzle Brake 2 items
  31. Pistol Grip 1 item
  32. Safety Selector 1 item
  33. Sight Post 7 items
  34. Spring 1 item
  35. Stock 3 items
  36. Stock Adapter 1 item
  37. Take Down / Pivot Pins 4 items
  38. Trigger 2 items
Rail Length
  1. 4" 1 item
  2. 4.25" 1 item
  3. 4.5" 1 item
  4. 5.5" 1 item
  5. 6.7" 5 items
  6. 7" 6 items
  7. 7.2" 1 item
  8. 7.5" 2 items
  9. 8" 1 item
  10. 8.5" 2 items
  11. 8.6" 1 item
  12. 9" 6 items
  13. 9.15" 2 items
  14. 9.2" 1 item
  15. 9.3" 2 items
  16. 9.5" 5 items
  17. 9.55" 1 item
  18. 9.6" 5 items
  19. 10" 9 items
  20. 10.3" 1 item
  21. 10.5" 5 items
  22. 11" 3 items
  23. 11.1" 1 item
  24. 11.25" 1 item
  25. 11.5" 2 items
  26. 11.8" 2 items
  27. 12" 15 items
  28. 12.3" 1 item
  29. 12.4" 2 items
  30. 12.43" 1 item
  31. 12.5" 3 items
  32. 12.6" 3 items
  33. 12.8" 1 item
  34. 13" 4 items
  35. 13.5" 8 items
  36. 13.7" 1 item
  37. 13.8" 5 items
  38. 14.3" 1 item
  39. 15" 17 items
  40. 15.3" 5 items
  41. 16.3" 1 item
  42. 16.5" 4 items
  43. 18" 1 item
Size
  1. Medium 2 items
  2. Large 2 items
  3. X-Large 2 items
  4. 5 Slot 3 items
  5. 9 Slot 8 items
Thread Pitch
  1. 1/2x28 (.22 cal) 6 items
  2. 5/8x24 (.30 cal) 2 items
Stock Status
  1. In stock 158 items Remove This Item
  2. Out of stock 4 items
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