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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. 10.5" 2 items
  2. 11.5" 2 items
  3. 12" 5 items
  4. 12.5" 9 items
  5. 13.7" 5 items
  6. 13.9" 3 items
  7. 14.5" 17 items
  8. 16" 37 items
  9. 16.1" 2 items
  10. 18" 1 item
Barrel Profile
  1. Lightweight 6 items
  2. MK12 SPR 2 items
  3. Non-fluted 1 item
Caliber
  1. .223 Rem 1 item
  2. .223 Wylde 13 items
  3. .308 Win 3 items
  4. 5.56 NATO 43 items
  5. 6mm ARC 6 items
  6. 6.5 Grendel 6 items
  7. 7.62x39 1 item
  8. 7.62x51 2 items
Category
  1. Receiver Parts 9 items
  2. Barrels 63 items
  3. Buffer Systems 2 items
  4. Gas Systems 8 items
  5. Muzzle Devices 3 items
  6. Stocks & Braces 2 items
Color
Configuration
  1. Clamp on Piston Block 1 item
  2. Solid Piston Block 1 item
Finish
  1. Carbon Fiber 2 items
  2. Nitride 24 items
  3. Phosphate 1 item
  4. Polished 2 items
  5. Satin 11 items
Gas Block Diameter
  1. .625" 15 items
  2. .750" 52 items
  3. .936" 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Ballistic Advantage 7 items
  3. Boss Barrels 2 items
  4. Bravo Company MFG (BCM) 1 item
  5. Christensen Arms 2 items
  6. Daniel Defense 1 item
  7. Faxon Firearms 12 items
  8. Geissele 2 items
  9. Lantac 1 item
  10. Magpul Industries 2 items
  11. Noveske 8 items
  12. Precision Armament 1 item
  13. Rainier Arms, LLC 30 items
  14. Riflespeed 1 item
  15. Sons of Liberty Gun Works 7 items
  16. Superlative Arms 4 items
  17. Tactical Edge Arms 1 item
  18. VLTOR 4 items
Mount
  1. KeyMod 6 items
  2. M-LOK 3 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 6 items
Platform
  1. AR-10/LR308 4 items
  2. AR-15 63 items
Product Type
  1. AR-10/LR308 Barrel 4 items
  2. AR-15 Barrel 59 items
  3. AR-15 Complete Upper Receiver 3 items
  4. AR-15 Partial Upper Receiver 6 items
  5. Buffer Kit 1 item
  6. Buffer Tube 1 item
  7. Flash Hider 2 items
  8. Gas Tube 4 items
  9. Muzzle Brake 1 item
  10. Piston System 4 items
  11. Stock 2 items
Rail Length
  1. 9.55" 1 item
  2. 10" 6 items
  3. 10.7" 1 item
  4. 11.7" 1 item
  5. 12.5" 1 item
  6. 13" 1 item
  7. 13.7" 1 item
  8. 14" 1 item
  9. 15" 4 items
Size
  1. Small 1 item
  2. X-Large 2 items
  3. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 (.22 cal) 52 items
  2. 5/8x24 (.30 cal) 17 items
Threaded
  1. Yes 4 items
Twist Rate
  1. 1:7 31 items
  2. 1:7.5 1 item
  3. 1:8 31 items
  4. 1:10 3 items
Stock Status
  1. In stock 87 items Remove This Item
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