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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 5/8x24 (.30 cal) Remove This Item
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Barrel Length
  1. 5.5" 1 item
  2. 6" 1 item
  3. 6.5" 1 item
  4. 7" 1 item
  5. 7.5" 2 items
  6. 8" 3 items
  7. 8.3" 1 item
  8. 8.5" 1 item
  9. 9" 1 item
  10. 10.5" 1 item
  11. 10.7" 1 item
  12. 11.5" 1 item
  13. 12" 1 item
  14. 12.5" 1 item
  15. 13" 1 item
  16. 16" 8 items
  17. 16.1" 1 item
  18. 16.3" 1 item
  19. 18" 9 items
  20. 20" 7 items
  21. 22" 11 items
  22. 24" 1 item
Barrel Profile
  1. DMR 2 items
  2. MK12 SPR 2 items
Caliber
  1. .30 Cal 1 item
  2. .308 Win 12 items
  3. .338 1 item
  4. 300 Blackout 16 items
  5. 6mm ARC 5 items
  6. 6.5 Creedmoor 7 items
  7. 6.5 Grendel 1 item
  8. 6MM Creedmoor 11 items
  9. 7.62mm 1 item
  10. 7.62x39 1 item
  11. 8.6 Blackout 5 items
Category
  1. Receiver Parts 7 items
  2. Barrels 49 items
  3. Muzzle Devices 14 items
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Finish
  1. DLC 1 item
  2. Nitride 7 items
  3. Polished 10 items
  4. Satin 17 items
  5. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .750" 20 items
  2. .875" 5 items
  3. .936" 1 item
Gas System Length
  1. Pistol 9 items
  2. Carbine 2 items
  3. Mid 5 items
  4. Rifle 8 items
  5. Rifle +2 3 items
Manufacturer
  1. Advanced Armament Company (AAC) 1 item
  2. Aero Precision 1 item
  3. Ballistic Advantage 9 items
  4. Bootleg 1 item
  5. Bravo Company MFG (BCM) 1 item
  6. Faxon Firearms 8 items
  7. Forward Controls Design 1 item
  8. Heresy Design 1 item
  9. HUXWRX 1 item
  10. JMAC Customs 1 item
  11. Knight’s Armament Company (KAC) 1 item
  12. Mad Pig 1 item
  13. Maxim Defense 1 item
  14. Precision Armament 3 items
  15. Q, LLC 4 items
  16. Rainier Arms, LLC 28 items
  17. Sig Sauer 1 item
  18. Silencerco 2 items
  19. Spinta Precision 1 item
  20. V Seven Weapon Systems 3 items
Mount
  1. M-LOK 2 items
Option
  1. AR-10 1 item
  2. AR-15 1 item
Platform
  1. AR-10/LR308 11 items
  2. AR-15 15 items
  3. Remington 700 9 items
  4. Ruger Precision Rifle 1 item
  5. Savage Small Shank 10 items
  6. Steyr Aug 1 item
Product Type
  1. AR-10/LR308 Barrel 12 items
  2. AR-10 Partial Upper Receiver 1 item
  3. AR-15 Barrel 15 items
  4. AR-15 Complete Upper Receiver 2 items
  5. AR-15 Partial Upper Receiver 2 items
  6. Bolt-Action Barrel 21 items
  7. Compensator 2 items
  8. Complete Upper 2 items
  9. Flash Hider 4 items
  10. Muzzle Brake 8 items
  11. Steyr Aug Barrel 1 item
Rail Length
  1. 5" 1 item
  2. 7" 1 item
  3. 9.5" 1 item
Threaded
  1. Yes 9 items
Twist Rate
  1. 1:3 3 items
  2. 1:5 2 items
  3. 1:6 1 item
  4. 1:7 13 items
  5. 1:7.5 8 items
  6. 1:8 14 items
  7. 1:10 12 items
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  1. Out of stock 70 items Remove This Item
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