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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. 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" 19 items
  9. 11.5" 7 items
  10. 11.85" 1 item
  11. 12.3" 1 item
  12. 12.5" 9 items
  13. 13" 1 item
  14. 13.7" 6 items
  15. 13.9" 4 items
  16. 14.5" 18 items
  17. 16" 25 items
  18. 16.1" 3 items
  19. 16.3" 1 item
  20. 18" 14 items
  21. 20" 3 items
Barrel Profile
  1. Lightweight 13 items
  2. M16A1 1 item
  3. MK12 SPR 5 items
  4. Non-fluted 2 items
Caliber
  1. .22 ARC 1 item
  2. .22 LR 2 items
  3. .223/5.56 10 items
  4. .223 Rem 1 item
  5. .223 Wylde 38 items
  6. .30 Cal 3 items
  7. .308 3 items
  8. 5.56X45 1 item
  9. 5.56 NATO 83 items
  10. 5.56mm 6 items
  11. 7.62mm 3 items
  12. 9mm 2 items
Category
  1. Receiver Parts 23 items
  2. Parts & Kits 2 items
  3. Barrels 94 items
  4. Muzzle Devices 86 items
  5. MILSPEC Parts 2 items
Color
Configuration
  1. Gen 3 1 item
Finish
  1. Black 4 items
  2. Carbon Fiber 2 items
  3. DLC 1 item
  4. Nitride 35 items
  5. Polished 4 items
  6. Satin 16 items
  7. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 19 items
  2. .750" 78 items
  3. .936" 2 items
Gas System Length
  1. Pistol 6 items
  2. Carbine 30 items
  3. Mid 55 items
  4. Intermediate 2 items
  5. Rifle 16 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 3 items
  2. Aero Precision 1 item
  3. Andro Corp Industries 2 items
  4. Ballistic Advantage 8 items
  5. Blackout Defense 1 item
  6. Bootleg 1 item
  7. Boss Barrels 2 items
  8. Bravo Company MFG (BCM) 5 items
  9. Centurion Arms 2 items
  10. Christensen Arms 2 items
  11. Cross Machine Tool (CMT) 1 item
  12. Daniel Defense 5 items
  13. Dead Air Armament 3 items
  14. Faxon Firearms 14 items
  15. Fortis MFG 1 item
  16. Forward Controls Design 12 items
  17. Geissele 4 items
  18. Griffin Armament 1 item
  19. HERA ARMS 1 item
  20. Heresy Design 2 items
  21. HUXWRX 4 items
  22. Icon Defense 2 items
  23. JK Armament 1 item
  24. JMAC Customs 10 items
  25. Kinetic Development Group 1 item
  26. Knight’s Armament Company (KAC) 1 item
  27. Lantac 3 items
  28. Mad Pig 1 item
  29. Maxim Defense 3 items
  30. NEMO Arms 1 item
  31. Next Level Armament 2 items
  32. Noveske 15 items
  33. Precision Armament 4 items
  34. Primary Weapon Systems 6 items
  35. Q, LLC 1 item
  36. Rainier Arms, LLC 48 items
  37. Rainier Industries 2 items
  38. Rex Silentium 1 item
  39. Rise Armament 1 item
  40. Sharps Bros 2 items
  41. Sig Sauer 1 item
  42. Silencerco 1 item
  43. Sons of Liberty Gun Works 15 items
  44. Spinta Precision 1 item
  45. Surefire 2 items
  46. Tactical Edge Arms 1 item
  47. Torrent Suppressors 1 item
  48. V Seven Weapon Systems 2 items
Mount
  1. KeyMod 1 item
  2. M-LOK 7 items
  3. Picatinny 1 item
Option
  1. AR-10 3 items
  2. AR-15 5 items
Platform
  1. AR-15 99 items
  2. Ruger 10/22 1 item
  3. Steyr Aug 2 items
Product Type
  1. 10/22 Barrel 2 items
  2. AR-15 Barrel 90 items
  3. AR-15 Complete Upper Receiver 11 items
  4. AR-15 Partial Upper Receiver 11 items
  5. AR-15 Handguard 1 item
  6. Compensator 21 items
  7. Crush Washer 2 items
  8. Flash Hider 27 items
  9. Muzzle Brake 33 items
  10. Muzzle Device Accessory 4 items
  11. Shim Set 2 items
  12. Steyr Aug Barrel 2 items
Rail Length
  1. 9" 1 item
  2. 9.2" 1 item
  3. 9.5" 2 items
  4. 9.55" 3 items
  5. 10" 1 item
  6. 10.5" 1 item
  7. 10.7" 1 item
  8. 11" 2 items
  9. 11.7" 1 item
  10. 11.75" 1 item
  11. 12" 1 item
  12. 12.5" 1 item
  13. 13.7" 1 item
  14. 15" 7 items
  15. 15.25" 1 item
Size
  1. 3" 1 item
  2. X-Large 1 item
  3. 6" 1 item
Threaded
  1. Yes 27 items
Twist Rate
  1. 1:7 55 items
  2. 1:7.5 7 items
  3. 1:8 42 items
  4. 1:16 2 items
Stock Status
  1. In stock 206 items Remove This Item
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