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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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  3. Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    $188.60
    Out of stock
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  4. Fortis MFG RED Brake 5.56mm
    Fortis MFG RED Brake 5.56mm
    Out of stock
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  11. Noveske 3 Lug Adapter 1/2X28
    Noveske 3 Lug Adapter 1/2X28
    $71.25
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  13. Noveske Two Port 5.56mm Muzzle Brake - 1/2x28
    Noveske Two Port 5.56mm Muzzle Brake - 1/2x28
    $84.55
    Out of stock
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  16. JK Armament 155 HD Thread Mount - 1/2x28
    JK Armament 155 HD Thread Mount - 1/2x28
    $90.00
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  1. Thread Pitch 1/2x28 (.22 cal) Remove This Item
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Barrel Length
  1. 6" 1 item
  2. 6.75" 1 item
  3. 7.5" 3 items
  4. 7.75" 1 item
  5. 8" 1 item
  6. 8.5" 2 items
  7. 10.3" 5 items
  8. 10.5" 25 items
  9. 11.5" 12 items
  10. 12" 2 items
  11. 12.3" 1 item
  12. 12.5" 14 items
  13. 13.7" 7 items
  14. 13.9" 5 items
  15. 14.5" 21 items
  16. 16" 40 items
  17. 16.1" 3 items
  18. 16.3" 1 item
  19. 18" 23 items
  20. 20" 7 items
  21. 22" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 13 items
  3. M16A1 1 item
  4. MK12 SPR 9 items
  5. Non-fluted 2 items
Caliber
  1. .22 ARC 5 items
  2. .22 LR 2 items
  3. .223/5.56 15 items
  4. .223 Rem 1 item
  5. .223 Wylde 50 items
  6. .30 Cal 6 items
  7. .308 3 items
  8. 5.56X45 1 item
  9. 5.56 NATO 124 items
  10. 5.56mm 9 items
  11. 7.62mm 3 items
  12. 9mm 3 items
Category
  1. Receiver Parts 26 items
  2. Parts & Kits 2 items
  3. Barrels 140 items
  4. Muzzle Devices 119 items
  5. MILSPEC Parts 3 items
Color
Configuration
  1. Gen 3 1 item
Finish
  1. Black 4 items
  2. Carbon Fiber 2 items
  3. Cerakote 1 item
  4. DLC 2 items
  5. Nitride 52 items
  6. Polished 6 items
  7. Satin 24 items
  8. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 23 items
  2. .750" 123 items
  3. .875" 2 items
  4. .936" 2 items
Gas System Length
  1. Pistol 6 items
  2. Carbine 40 items
  3. Mid 71 items
  4. Intermediate 6 items
  5. Rifle 28 items
  6. Rifle +1 2 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 4 items
  2. Aero Precision 1 item
  3. Aeroknox 1 item
  4. Andro Corp Industries 2 items
  5. Ballistic Advantage 16 items
  6. Blackout Defense 1 item
  7. Bootleg 1 item
  8. Boss Barrels 2 items
  9. Bravo Company MFG (BCM) 7 items
  10. Centurion Arms 4 items
  11. Christensen Arms 2 items
  12. Cross Machine Tool (CMT) 1 item
  13. Daniel Defense 6 items
  14. Dead Air Armament 3 items
  15. Faxon Firearms 22 items
  16. Ferfrans 1 item
  17. Fortis MFG 3 items
  18. Forward Controls Design 14 items
  19. Geissele 4 items
  20. Griffin Armament 6 items
  21. HERA ARMS 2 items
  22. Heresy Design 2 items
  23. HUXWRX 4 items
  24. Icon Defense 2 items
  25. JK Armament 2 items
  26. JMAC Customs 12 items
  27. Kinetic Development Group 1 item
  28. Knight’s Armament Company (KAC) 4 items
  29. Lantac 4 items
  30. Mad Pig 1 item
  31. Maxim Defense 2 items
  32. NEMO Arms 2 items
  33. Next Level Armament 2 items
  34. Noveske 24 items
  35. Precision Armament 6 items
  36. Primary Weapon Systems 5 items
  37. Q, LLC 1 item
  38. Rainier Arms, LLC 65 items
  39. Rainier Industries 2 items
  40. Rex Silentium 1 item
  41. Rise Armament 1 item
  42. Sharps Bros 3 items
  43. Sig Sauer 1 item
  44. Silencerco 2 items
  45. Sons of Liberty Gun Works 19 items
  46. Spinta Precision 2 items
  47. Surefire 4 items
  48. Tactical Edge Arms 1 item
  49. Taran Tactical Innovations 1 item
  50. Torrent Suppressors 1 item
  51. V Seven Weapon Systems 2 items
  52. VKTR Industries 3 items
Mount
  1. KeyMod 1 item
  2. M-LOK 8 items
  3. Picatinny 2 items
Option
  1. AR-10 4 items
  2. AR-15 7 items
Platform
  1. AR-15 150 items
  2. Ruger 10/22 1 item
  3. Steyr Aug 2 items
Price
  1. $0.00 - $99.99 80 items
  2. $100.00 - $199.99 84 items
  3. $200.00 - $299.99 44 items
  4. $300.00 - $399.99 24 items
  5. $400.00 - $499.99 19 items
  6. $500.00 - $599.99 16 items
  7. $600.00 - $699.99 8 items
  8. $700.00 - $799.99 6 items
  9. $800.00 - $899.99 4 items
  10. $900.00 and above 3 items
Product Type
  1. 10/22 Barrel 2 items
  2. AR-15 Barrel 136 items
  3. AR-15 Complete Upper Receiver 6 items
  4. AR-15 Partial Upper Receiver 18 items
  5. AR-15 Handguard 1 item
  6. AR-15 Upper Receiver Group 1 item
  7. Compensator 28 items
  8. Crush Washer 2 items
  9. Flash Hider 32 items
  10. Muzzle Brake 50 items
  11. Muzzle Device Accessory 8 items
  12. Shim Set 2 items
  13. Steyr Aug Barrel 2 items
Rail Length
  1. 9" 1 item
  2. 9.2" 1 item
  3. 9.5" 2 items
  4. 9.55" 4 items
  5. 10" 1 item
  6. 10.5" 1 item
  7. 10.7" 2 items
  8. 11" 1 item
  9. 11.7" 2 items
  10. 11.75" 1 item
  11. 12" 2 items
  12. 12.5" 1 item
  13. 13" 1 item
  14. 13.7" 2 items
  15. 15" 8 items
  16. 15.25" 1 item
Size
  1. 3" 1 item
  2. X-Large 1 item
  3. 6" 1 item
Threaded
  1. Yes 35 items
  2. No 1 item
Twist Rate
  1. 1:7 86 items
  2. 1:7.5 12 items
  3. 1:8 55 items
  4. 1:16 2 items
Stock Status
  1. In stock 199 items
  2. Out of stock 89 items
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