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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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  4. Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    $165.60
    Out of stock
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  5. Patriot Ordnance Factory (POF) Roller Cam Pin
    Patriot Ordnance Factory (POF) Roller Cam Pin
    Out of stock
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Items 113-117 of 117

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  1. Barrel Length 16" Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
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Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 3 items
  3. MK12 SPR 2 items
  4. Non-fluted 2 items
Caliber
  1. .223/5.56 1 item
  2. .223 Rem 1 item
  3. .223 Wylde 14 items
  4. .308 1 item
  5. .308 Win 17 items
  6. .458 Socom 1 item
  7. 300 Blackout 7 items
  8. 350 Legend 1 item
  9. 5.56X45 2 items
  10. 5.56 NATO 33 items
  11. 6mm ARC 6 items
  12. 6.5 Creedmoor 2 items
  13. 6.5 Grendel 3 items
  14. 7.62x39 2 items
  15. 7.62x51 4 items
  16. 8.6 Blackout 4 items
  17. 9mm 10 items
Category
  1. Receiver Parts 19 items
  2. Parts & Kits 3 items
  3. Barrels 81 items
  4. Buffer Systems 4 items
  5. Gas Systems 1 item
  6. Muzzle Devices 4 items
  7. Bolt Parts 1 item
  8. Grips 1 item
  9. Stocks & Braces 3 items
Color
Configuration
  1. M-LOK 4 items
Finish
  1. Carbon Fiber 1 item
  2. Chrome 1 item
  3. Nitride 27 items
  4. Phosphate 1 item
  5. Polished 9 items
  6. Satin 18 items
Gas Block Diameter
  1. .625" 8 items
  2. .750" 58 items
  3. .875" 2 items
  4. .936" 1 item
Gas System Length
  1. Blowback 6 items
  2. Pistol 7 items
  3. Carbine 8 items
  4. Mid 61 items
  5. Intermediate 8 items
  6. Rifle 9 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Angstadt Arms 2 items
  3. Ballistic Advantage 7 items
  4. Bootleg 1 item
  5. Boss Barrels 5 items
  6. Bravo Company MFG (BCM) 6 items
  7. Centurion Arms 1 item
  8. Christensen Arms 1 item
  9. Daniel Defense 1 item
  10. Faxon Firearms 18 items
  11. Geissele 1 item
  12. Lewis Machine & Tool (LMT) 3 items
  13. Magpul Industries 2 items
  14. Noveske 3 items
  15. Patriot Ordnance Factory (POF) 1 item
  16. Precision Armament 1 item
  17. R&D Precision 1 item
  18. Rainier Arms, LLC 44 items
  19. Sharps Bros 1 item
  20. Sons of Liberty Gun Works 5 items
  21. Spinta Precision 1 item
  22. Stag Arms 1 item
  23. Troy Industries 1 item
  24. VLTOR 7 items
Mount
  1. KeyMod 13 items
  2. M-LOK 5 items
  3. Picatinny 3 items
Option
  1. AR-10 1 item
  2. AR-15 15 items
Platform
  1. AR-10/LR308 14 items
  2. AR-15 63 items
  3. Remington 700 2 items
  4. Ruger Precision Rifle 2 items
  5. Savage Small Shank 3 items
  6. Sig Cross 2 items
Price
  1. $0.00 - $99.99 15 items
  2. $100.00 - $199.99 12 items
  3. $200.00 - $299.99 32 items
  4. $300.00 - $399.99 12 items
  5. $400.00 - $499.99 20 items
  6. $500.00 - $599.99 11 items
  7. $600.00 - $699.99 5 items
  8. $700.00 - $799.99 4 items
  9. $800.00 and above 6 items
Product Type
  1. AR-10/LR308 Barrel 14 items
  2. AR-15 Barrel 57 items
  3. AR-15 Complete Upper Receiver 4 items
  4. AR-15 Partial Upper Receiver 11 items
  5. AR-15 Stripped Upper Receiver 1 item
  6. AR-9 Upper Receiver 1 item
  7. Bolt-Action Barrel 10 items
  8. Buffer Kit 1 item
  9. Buffer Tube 3 items
  10. Cam Pin 1 item
  11. Complete Upper 2 items
  12. End Plate 1 item
  13. Flash Hider 3 items
  14. Muzzle Brake 1 item
  15. Parts Kit 1 item
  16. Patch 1 item
  17. Stock 2 items
Rail Length
  1. 9.2" 1 item
  2. 9.5" 1 item
  3. 9.55" 1 item
  4. 10" 13 items
  5. 10.7" 1 item
  6. 11" 1 item
  7. 11.7" 1 item
  8. 12" 2 items
  9. 13.7" 1 item
  10. 14" 1 item
  11. 15" 11 items
Size
  1. Small 1 item
  2. X-Large 2 items
  3. 9 Slot 13 items
Thread Pitch
  1. 1/2x28 (9mm) 6 items
  2. 1/2x28 (.22 cal) 39 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 38 items
  5. 11/16x24 1 item
  6. M18x1.5 2 items
Threaded
  1. Yes 8 items
Twist Rate
  1. 1:3 4 items
  2. 1:7 24 items
  3. 1:7.5 8 items
  4. 1:8 27 items
  5. 1:10 28 items
  6. 1:14 1 item
Stock Status
  1. In stock 74 items
  2. Out of stock 43 items
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