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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. Bravo Company MFG (BCM) Gunfighter AR-15 MCMR Rail - 15"
    Bravo Company MFG (BCM) Gunfighter AR-15 MCMR Rail - 15"
    $234.95
    Out of stock
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  2. Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    $139.99
    Out of stock
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  3. Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    $91.99
    Out of stock
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  4. Hera Arms HUS AR-15 Billet Upper Receivers
    Hera Arms HUS AR-15 Billet Upper Receivers
    $139.00
    Out of stock
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  6. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
    Out of stock
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  9. Battle Arms Development Complete Enhanced Lower Parts Kit
    Battle Arms Development Complete Enhanced Lower Parts Kit
    $125.00
    Out of stock
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  10. Battle Arms Development Enhanced Pins Set
    Battle Arms Development Enhanced Pins Set
    Special Price $16.92 Regular Price $28.45
    Out of stock
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  12. Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    Sharps Bros THE JACK AR-15 Lower Receiver - Gen 2
    $275.45
    Out of stock
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  13. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  14. Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    $395.00
    Out of stock
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  15. Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    $229.99
    Out of stock
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Items 241-256 of 276

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  1. Price $0.00 - $999.99 Remove This Item
  2. Option AR-15 Remove This Item
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Barrel Length
  1. 7" 3 items
  2. 10.3" 2 items
  3. 16" 15 items
  4. 18" 10 items
Caliber
  1. .223/5.56 3 items
  2. .223 Rem 1 item
  3. .308 1 item
  4. .45 ACP 1 item
  5. 300 Blackout 1 item
  6. 5.56 NATO 8 items
  7. 5.56mm 1 item
  8. 6.8 SPC 1 item
  9. 7.62x51 3 items
  10. 9mm 2 items
Category
  1. Receiver Parts 89 items
  2. Parts & Kits 35 items
  3. Buffer Systems 12 items
  4. Trigger Parts 5 items
  5. Gas Systems 1 item
  6. Muzzle Devices 9 items
  7. Bolt Parts 16 items
  8. Grips 3 items
  9. Charging Handles 26 items
  10. Rifle Handguards 63 items
  11. Stocks & Braces 7 items
Color
Configuration
  1. AR-10 1 item
  2. AR-15 13 items
  3. M-LOK 7 items
  4. Rifle 1 item
  5. Right Hand 1 item
Finish
  1. Black 5 items
  2. Carbon Fiber 1 item
  3. Cerakote 1 item
  4. Chrome 1 item
  5. DLC 1 item
  6. FDE 1 item
  7. Nitride 1 item
  8. Phosphate 2 items
  9. Anodize 20 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol 5 items
  2. Mid 13 items
  3. Intermediate 10 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.08" 1 item
  2. 1.15" 1 item
  3. 1.3" 3 items
  4. 1.315" 4 items
  5. 1.34" 3 items
  6. 1.385" 1 item
  7. 1.4" 2 items
  8. 1.42" 1 item
  9. 1.54" 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. Aero Precision 23 items
  2. Aeroknox 3 items
  3. Airborne Arms 1 item
  4. Andro Corp Industries 4 items
  5. Angstadt Arms 1 item
  6. Armaspec 1 item
  7. Arms Republic 2 items
  8. Ballistic Advantage 5 items
  9. Battle Arms Development 8 items
  10. Blitzkrieg Components 8 items
  11. Bootleg 2 items
  12. Bravo Company MFG (BCM) 17 items
  13. Brigand Arms 1 item
  14. Centurion Arms 10 items
  15. Cross Machine Tool (CMT) 7 items
  16. Daniel Defense 4 items
  17. DPM Systems Technologies 1 item
  18. Elftmann Tactical 1 item
  19. F-1 Firearms 1 item
  20. Faxon Firearms 2 items
  21. Fortis MFG 17 items
  22. Forward Controls Design 11 items
  23. FosTecH 1 item
  24. Geissele 9 items
  25. Grey Ghost Precision 1 item
  26. Griffin Armament 5 items
  27. Half Cocked Arms (HCA) 1 item
  28. HERA ARMS 6 items
  29. Icarus Precision 1 item
  30. James Madison Tactical (JMT) 1 item
  31. JL Billet 4 items
  32. JP Enterprises Inc 8 items
  33. Knight’s Armament Company (KAC) 2 items
  34. KNS Precision 4 items
  35. Lantac 4 items
  36. Lewis Machine & Tool (LMT) 1 item
  37. Magpul Industries 5 items
  38. Maxim Defense 2 items
  39. Midwest Industries 1 item
  40. NEMO Arms 1 item
  41. Next Level Armament 4 items
  42. Noveske 9 items
  43. Patriot Ordnance Factory (POF) 3 items
  44. Precision Armament 2 items
  45. Primary Weapon Systems 1 item
  46. Radian Weapons 6 items
  47. Rainier Arms, LLC 6 items
  48. Rainier Industries 4 items
  49. Rise Armament 1 item
  50. RogueOps 3 items
  51. Sharps Bros 7 items
  52. Silencerco 3 items
  53. Sionics Weapon Systems 3 items
  54. Sons of Liberty Gun Works 5 items
  55. Stag Arms 1 item
  56. Strike Industries 2 items
  57. Tactical Edge Arms 1 item
  58. Timney Triggers 1 item
  59. Troy Industries 1 item
  60. Tyrant Designs 2 items
  61. Underground Tactical 1 item
  62. V Seven Weapon Systems 8 items
  63. VLTOR 8 items
  64. WMD Guns 4 items
Mount
  1. KeyMod 13 items
  2. M-LOK 39 items
  3. Picatinny 21 items
Platform
  1. AR-15 15 items
Price
  1. $0.00 - $99.99 109 items
  2. $100.00 - $199.99 75 items
  3. $200.00 - $299.99 58 items
  4. $300.00 - $399.99 21 items
  5. $400.00 - $499.99 8 items
  6. $500.00 - $599.99 3 items
  7. $600.00 - $699.99 1 item
  8. $800.00 and above 1 item
Product Type
  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 6 items
  4. AR-15 Charging Handle 23 items
  5. AR-15 Complete Lower Receiver 13 items
  6. AR-15 Partial Upper Receiver 1 item
  7. AR-15 Handguard 56 items
  8. AR-15 Receiver Set 9 items
  9. AR-15 Stripped Lower Receiver 29 items
  10. AR-15 Stripped Upper Receiver 28 items
  11. Bolt 1 item
  12. Bolt Carrier Group 13 items
  13. Bolt Catch 5 items
  14. Brace 1 item
  15. Buffer 1 item
  16. Buffer Kit 5 items
  17. Buffer Spring 1 item
  18. Buffer Tube 3 items
  19. Builders Kit 1 item
  20. Cam Pin 1 item
  21. Castle Nut / End Plate 2 items
  22. Charging Handle 8 items
  23. Chassis 1 item
  24. Compensator 1 item
  25. Dust Cover 3 items
  26. End Plate 1 item
  27. Flash Hider 5 items
  28. Forearm Accesory 3 items
  29. Front Sight 1 item
  30. Grip Module 1 item
  31. Handguard 10 items
  32. Lower Parts Kit 10 items
  33. Magazine 1 item
  34. Muzzle Brake 3 items
  35. Parts Kit 1 item
  36. Patch 1 item
  37. Pistol Grip 1 item
  38. Safety Selector 3 items
  39. Sight Post 8 items
  40. Silent Captured Spring 1 item
  41. Spring 1 item
  42. Stock 3 items
  43. Stock Adapter 2 items
  44. Take Down / Pivot Pins 7 items
  45. Trigger 3 items
  46. Trigger Guard 1 item
  47. Upper Parts Kit 1 item
Rail Length
  1. 4" 2 items
  2. 4.25" 1 item
  3. 4.5" 1 item
  4. 5.5" 2 items
  5. 6.7" 8 items
  6. 7" 10 items
  7. 7.2" 1 item
  8. 7.5" 2 items
  9. 8" 1 item
  10. 8.5" 1 item
  11. 8.6" 1 item
  12. 9" 8 items
  13. 9.15" 2 items
  14. 9.2" 1 item
  15. 9.3" 2 items
  16. 9.5" 7 items
  17. 9.55" 1 item
  18. 9.6" 6 items
  19. 10" 16 items
  20. 10.25" 1 item
  21. 10.3" 1 item
  22. 10.5" 6 items
  23. 11" 3 items
  24. 11.1" 2 items
  25. 11.25" 1 item
  26. 11.5" 2 items
  27. 11.8" 2 items
  28. 12" 21 items
  29. 12.25" 1 item
  30. 12.3" 1 item
  31. 12.4" 3 items
  32. 12.43" 1 item
  33. 12.5" 4 items
  34. 12.6" 3 items
  35. 12.8" 1 item
  36. 13" 7 items
  37. 13.5" 9 items
  38. 13.7" 5 items
  39. 13.8" 6 items
  40. 14" 1 item
  41. 14.3" 1 item
  42. 15" 31 items
  43. 15.3" 6 items
  44. 16.3" 1 item
  45. 16.5" 4 items
  46. 17" 1 item
  47. 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 18 items
Thread Pitch
  1. 1/2x28 (.22 cal) 7 items
  2. 5/8x24 (.30 cal) 3 items
Stock Status
  1. In stock 157 items
  2. Out of stock 118 items
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