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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" 6 items
  5. 16.1" 1 item
  6. 18" 7 items
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Rem 1 item
  3. .223 Wylde 1 item
  4. 300 Blackout 1 item
  5. 5.56 NATO 5 items
  6. 5.56mm 1 item
  7. 6.8 SPC 1 item
  8. 7.62x51 1 item
  9. 9mm 2 items
Category
  1. Receiver Parts 51 items
  2. Parts & Kits 20 items
  3. Buffer Systems 8 items
  4. Trigger Parts 2 items
  5. Muzzle Devices 6 items
  6. Bolt Parts 7 items
  7. Grips 1 item
  8. Charging Handles 19 items
  9. Rifle Handguards 38 items
  10. Stocks & Braces 5 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 8 items
  3. M-LOK 2 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 8 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol 3 items
  2. Mid 7 items
  3. Intermediate 7 items
Height
  1. Absolute Co-Witness 1 item
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. Battle Arms Development 1 item
  6. Blitzkrieg Components 7 items
  7. Bootleg 1 item
  8. Bravo Company MFG (BCM) 9 items
  9. Brigand Arms 1 item
  10. Centurion Arms 9 items
  11. Cross Machine Tool (CMT) 2 items
  12. Daniel Defense 4 items
  13. DPM Systems Technologies 1 item
  14. F-1 Firearms 1 item
  15. Fortis MFG 16 items
  16. Forward Controls Design 10 items
  17. FosTecH 1 item
  18. Geissele 6 items
  19. Grey Ghost Precision 1 item
  20. Griffin Armament 5 items
  21. Half Cocked Arms (HCA) 1 item
  22. HERA ARMS 3 items
  23. Icarus Precision 1 item
  24. JL Billet 4 items
  25. JP Enterprises Inc 8 items
  26. KNS Precision 3 items
  27. Lantac 1 item
  28. Lewis Machine & Tool (LMT) 1 item
  29. Magpul Industries 4 items
  30. Maxim Defense 3 items
  31. Next Level Armament 2 items
  32. Noveske 6 items
  33. Patriot Ordnance Factory (POF) 1 item
  34. Precision Armament 1 item
  35. Primary Weapon Systems 2 items
  36. Radian Weapons 6 items
  37. Rainier Arms, LLC 3 items
  38. Rainier Industries 3 items
  39. Rise Armament 1 item
  40. RogueOps 3 items
  41. Sharps Bros 5 items
  42. Silencerco 1 item
  43. Sons of Liberty Gun Works 4 items
  44. Strike Industries 2 items
  45. Tactical Edge Arms 1 item
  46. Timney Triggers 1 item
  47. Tyrant Designs 1 item
  48. Underground Tactical 1 item
  49. V Seven Weapon Systems 4 items
  50. VLTOR 4 items
Mount
  1. KeyMod 6 items
  2. M-LOK 24 items
  3. Picatinny 16 items
Platform
  1. AR-15 11 items
Price
  1. $0.00 - $999.99 162 items
  2. $1,000.00 and above 4 items
Product Type
  1. AR-15 Assembled Upper Receiver 3 items
  2. AR-15 Charging Handle 17 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 34 items
  7. AR-15 Receiver Set 5 items
  8. AR-15 Stripped Lower Receiver 17 items
  9. AR-15 Stripped Upper Receiver 15 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. Castle Nut / End Plate 2 items
  19. Charging Handle 6 items
  20. Chassis 1 item
  21. Complete Upper 1 item
  22. Dust Cover 3 items
  23. Flash Hider 4 items
  24. Forearm Accesory 2 items
  25. Front Sight 1 item
  26. Handguard 7 items
  27. Lower Parts Kit 5 items
  28. Magazine 1 item
  29. Muzzle Brake 2 items
  30. Pistol Grip 1 item
  31. Safety Selector 1 item
  32. Sight Post 7 items
  33. Silent Captured Spring 1 item
  34. Spring 1 item
  35. Stock 3 items
  36. Stock Adapter 1 item
  37. Take Down / Pivot Pins 5 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" 14 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 7 items
Thread Pitch
  1. 1/2x28 (.22 cal) 6 items
  2. 5/8x24 (.30 cal) 2 items
Stock Status
  1. In stock 159 items Remove This Item
  2. Out of stock 6 items
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