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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. Barrel Length 16" Remove This Item
  2. Gas System Length Mid Remove This Item
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Shopping Options
Barrel Profile
  1. Lightweight 3 items
  2. MK12 SPR 2 items
  3. Non-fluted 1 item
Caliber
  1. .223 Rem 1 item
  2. .223 Wylde 10 items
  3. .308 Win 3 items
  4. 5.56X45 1 item
  5. 5.56 NATO 34 items
  6. 6mm ARC 3 items
  7. 6.5 Grendel 1 item
  8. 7.62x39 1 item
  9. 7.62x51 3 items
Category
  1. Receiver Parts 16 items
  2. Parts & Kits 1 item
  3. Barrels 35 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 2 items
Color
Configuration
  1. M-LOK 2 items
Finish
  1. Carbon Fiber 1 item
  2. Chrome 1 item
  3. Nitride 11 items
  4. Phosphate 1 item
  5. Satin 5 items
  6. Anodize 1 item
Gas Block Diameter
  1. .625" 8 items
  2. .750" 34 items
  3. .936" 1 item
Height
  1. Absolute Co-Witness 1 item
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) 4 items
  5. Centurion Arms 1 item
  6. Christensen Arms 1 item
  7. Daniel Defense 3 items
  8. Faxon Firearms 12 items
  9. Geissele 1 item
  10. Magpul Industries 2 items
  11. Noveske 3 items
  12. Precision Armament 1 item
  13. Rainier Arms, LLC 10 items
  14. Sharps Bros 1 item
  15. Sons of Liberty Gun Works 5 items
  16. Stag Arms 1 item
  17. Troy Industries 1 item
  18. VLTOR 7 items
Mount
  1. KeyMod 13 items
  2. M-LOK 6 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 13 items
Platform
  1. AR-10/LR308 3 items
  2. AR-15 37 items
Price
  1. $0.00 - $999.99 61 items
  2. $1,000.00 and above 4 items
Product Type
  1. AR-10/LR308 Barrel 3 items
  2. AR-15 Barrel 32 items
  3. AR-15 Complete Upper Receiver 8 items
  4. AR-15 Partial Upper Receiver 8 items
  5. Buffer Kit 1 item
  6. Buffer Tube 3 items
  7. Flash Hider 3 items
  8. Muzzle Brake 1 item
  9. Patch 1 item
  10. Stock 2 items
Rail Length
  1. 9.5" 1 item
  2. 9.55" 1 item
  3. 10" 13 items
  4. 10.7" 1 item
  5. 11.7" 1 item
  6. 12.5" 2 items
  7. 13.7" 1 item
  8. 14" 1 item
  9. 15" 10 items
Size
  1. Small 1 item
  2. X-Large 2 items
  3. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 (.22 cal) 35 items
  2. 5/8x24 (.30 cal) 8 items
Threaded
  1. Yes 5 items
Twist Rate
  1. 1:7 24 items
  2. 1:7.5 1 item
  3. 1:8 18 items
  4. 1:10 3 items
Stock Status
  1. In stock 39 items
  2. Out of stock 26 items
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