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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. Gas Block Diameter .750" Remove This Item
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Barrel Length
  1. 6" 1 item
  2. 7.5" 2 items
  3. 7.94" 1 item
  4. 8" 1 item
  5. 8.3" 1 item
  6. 8.5" 1 item
  7. 9" 1 item
  8. 10.3" 1 item
  9. 10.5" 7 items
  10. 10.7" 1 item
  11. 11.5" 5 items
  12. 12" 3 items
  13. 12.5" 6 items
  14. 13.7" 1 item
  15. 14.5" 3 items
  16. 16" 18 items
  17. 16.1" 1 item
  18. 18" 12 items
  19. 20" 7 items
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 6 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 1 item
  2. .223 Wylde 12 items
  3. .308 Win 4 items
  4. 300 Blackout 10 items
  5. 5.56 NATO 38 items
  6. 6mm ARC 5 items
  7. 6.5 Creedmoor 1 item
  8. 6.5 Grendel 1 item
Category
  1. Receiver Parts 17 items
  2. Barrels 55 items
  3. Gas Systems 10 items
Color
Configuration
  1. .750 DIA 1 item
Finish
  1. Black Nitride 1 item
  2. Cerakote 1 item
  3. Nitride 16 items
  4. Satin 10 items
  5. Anodize 2 items
  6. Quench Polish Quench (QPQ) 2 items
Gas System Length
  1. Pistol 8 items
  2. Carbine 15 items
  3. Mid 20 items
  4. Intermediate 4 items
  5. Rifle 14 items
Height
  1. Absolute Co-Witness 2 items
Manufacturer
  1. Aero Precision 3 items
  2. Ballistic Advantage 17 items
  3. Battle Arms Development 1 item
  4. Bravo Company MFG (BCM) 1 item
  5. Centurion Arms 2 items
  6. Daniel Defense 2 items
  7. Faxon Firearms 11 items
  8. Geissele 1 item
  9. JP Enterprises Inc 1 item
  10. NEMO Arms 1 item
  11. Noveske 13 items
  12. Q, LLC 1 item
  13. Rainier Arms, LLC 19 items
  14. Sharps Bros 1 item
  15. Sons of Liberty Gun Works 2 items
  16. Spinta Precision 1 item
  17. Superlative Arms 1 item
  18. V Seven Weapon Systems 1 item
  19. VKTR Industries 3 items
Mount
  1. M-LOK 5 items
Option
  1. Adjustable 2 items
  2. Non-Adjustable 6 items
Platform
  1. AR-10/LR308 5 items
  2. AR-15 56 items
Product Type
  1. AR-10/LR308 Barrel 5 items
  2. AR-15 Barrel 50 items
  3. AR-15 Complete Upper Receiver 8 items
  4. AR-15 Partial Upper Receiver 8 items
  5. AR-15 Upper Receiver Group 1 item
  6. Gas Block 10 items
Rail Length
  1. 7" 2 items
  2. 9.5" 2 items
  3. 9.55" 1 item
  4. 9.75" 1 item
  5. 10.7" 1 item
  6. 11.7" 1 item
  7. 12.5" 1 item
  8. 13.7" 1 item
  9. 15" 6 items
Thread Pitch
  1. 1/2x28 (.22 cal) 50 items
  2. 5/8x24 (.30 cal) 20 items
Threaded
  1. Yes 9 items
  2. No 1 item
Twist Rate
  1. 1:5 2 items
  2. 1:7 42 items
  3. 1:7.5 5 items
  4. 1:8 14 items
  5. 1:10 4 items
Stock Status
  1. Out of stock 82 items Remove This Item
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