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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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Barrel Length
  1. 6.5" 3 items
  2. 6.75" 1 item
  3. 7" 1 item
  4. 7.5" 2 items
  5. 7.94" 1 item
  6. 8" 6 items
  7. 8.3" 1 item
  8. 9" 2 items
  9. 10" 1 item
  10. 10.3" 4 items
  11. 10.5" 20 items
  12. 10.7" 1 item
  13. 11.5" 9 items
  14. 12" 5 items
  15. 12.3" 1 item
  16. 12.5" 10 items
  17. 13" 1 item
  18. 13.7" 8 items
  19. 13.9" 2 items
  20. 14.5" 18 items
  21. 16" 27 items
  22. 16.1" 3 items
  23. 18" 11 items
  24. 20" 4 items
  25. 22" 4 items
Barrel Profile
  1. DMR 2 items
  2. Lightweight 1 item
  3. M16A1 1 item
  4. MK12 SPR 6 items
Caliber
  1. .22 ARC 5 items
  2. .223 Wylde 3 items
  3. 300 Blackout 19 items
  4. 5.56X45 4 items
  5. 5.56 NATO 97 items
  6. 6mm ARC 14 items
Category
  1. Receiver Parts 40 items
  2. Barrels 106 items
Color
Finish
  1. Black 1 item
  2. Cerakote 1 item
  3. Nitride 16 items
  4. Polished 5 items
  5. Satin 14 items
  6. Anodize 1 item
  7. Quench Polish Quench (QPQ) 3 items
Gas Block Diameter
  1. .625" 2 items
  2. .750" 106 items
  3. .875" 4 items
Gas System Length
  1. Pistol -1 1 item
  2. Pistol 17 items
  3. Carbine 34 items
  4. Mid 53 items
  5. Intermediate 3 items
  6. Rifle 8 items
  7. Rifle +1 4 items
  8. Rifle +2 2 items
Manufacturer
  1. Aero Precision 1 item
  2. Andro Corp Industries 1 item
  3. Ballistic Advantage 23 items
  4. Boss Barrels 3 items
  5. Bravo Company MFG (BCM) 5 items
  6. Centurion Arms 3 items
  7. Daniel Defense 11 items
  8. Faxon Firearms 2 items
  9. Geissele 4 items
  10. Lewis Machine & Tool (LMT) 9 items
  11. NEMO Arms 1 item
  12. Noveske 25 items
  13. Q, LLC 1 item
  14. Rainier Arms, LLC 32 items
  15. Rise Armament 1 item
  16. Sharps Bros 1 item
  17. Sons of Liberty Gun Works 17 items
  18. Spinta Precision 1 item
  19. V Seven Weapon Systems 2 items
  20. VKTR Industries 3 items
Mount
  1. M-LOK 16 items
Platform
  1. AR-15 125 items
Price
  1. $0.00 - $999.99 132 items
  2. $1,000.00 and above 14 items
Product Type
  1. AR-10 Partial Upper Receiver 1 item
  2. AR-15 Barrel 106 items
  3. AR-15 Complete Upper Receiver 19 items
  4. AR-15 Partial Upper Receiver 17 items
  5. AR-15 Handguard 1 item
  6. AR-15 Stripped Upper Receiver 1 item
  7. Complete Upper 1 item
Rail Length
  1. 5" 1 item
  2. 7" 2 items
  3. 8" 1 item
  4. 9.5" 5 items
  5. 9.55" 1 item
  6. 9.75" 1 item
  7. 10.5" 1 item
  8. 11.7" 1 item
  9. 12.5" 2 items
  10. 13" 1 item
  11. 13.5" 1 item
  12. 13.7" 1 item
  13. 15" 6 items
  14. 15.25" 1 item
Thread Pitch
  1. 1/2x28 (.22 cal) 92 items
  2. 5/8x24 (.30 cal) 31 items
Threaded
  1. Yes 17 items
  2. No 1 item
Stock Status
  1. In stock 82 items
  2. Out of stock 64 items
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