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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
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Barrel Profile
  1. Dissipator 2 items
  2. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 7 items
  3. .308 1 item
  4. .308 Win 5 items
  5. .458 Socom 1 item
  6. 300 Blackout 2 items
  7. 5.56X45 1 item
  8. 5.56 NATO 17 items
  9. 7.62x51 2 items
  10. 8.6 Blackout 2 items
  11. 9mm 6 items
Category
  1. Receiver Parts 15 items
  2. Parts & Kits 2 items
  3. Barrels 24 items
  4. Buffer Systems 2 items
  5. Gas Systems 1 item
  6. Muzzle Devices 1 item
  7. Bolt Parts 1 item
  8. Grips 1 item
  9. Stocks & Braces 1 item
Color
Configuration
  1. M-LOK 4 items
Finish
  1. Chrome 1 item
  2. Nitride 10 items
  3. Polished 2 items
  4. Satin 3 items
  5. Anodize 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 18 items
  3. .875" 1 item
Gas System Length
  1. Blowback 3 items
  2. Pistol 2 items
  3. Carbine 3 items
  4. Mid 27 items
  5. Intermediate 2 items
  6. Rifle 2 items
Height
  1. Absolute Co-Witness 2 items
Manufacturer
  1. Angstadt Arms 1 item
  2. Arms Republic 1 item
  3. Ballistic Advantage 2 items
  4. Blackout Defense 1 item
  5. Bravo Company MFG (BCM) 5 items
  6. Centurion Arms 1 item
  7. Faxon Firearms 10 items
  8. Lewis Machine & Tool (LMT) 1 item
  9. Noveske 3 items
  10. Patriot Ordnance Factory (POF) 1 item
  11. Rainier Arms, LLC 10 items
  12. Sharps Bros 1 item
  13. Sons of Liberty Gun Works 2 items
  14. Spinta Precision 1 item
  15. Stag Arms 1 item
  16. Troy Industries 1 item
  17. VKTR Industries 1 item
  18. VLTOR 3 items
Mount
  1. KeyMod 7 items
  2. M-LOK 4 items
  3. Picatinny 2 items
Option
  1. AR-15 9 items
  2. 9mm 1 item
Platform
  1. AR-10/LR308 3 items
  2. AR-15 21 items
  3. Remington 700 2 items
  4. Savage Small Shank 1 item
Product Type
  1. AR-10/LR308 Barrel 3 items
  2. AR-15 Barrel 17 items
  3. AR-15 Complete Upper Receiver 6 items
  4. AR-15 Partial Upper Receiver 6 items
  5. Bolt-Action Barrel 4 items
  6. Buffer Tube 2 items
  7. Cam Pin 1 item
  8. Complete Upper 3 items
  9. End Plate 1 item
  10. Flash Hider 1 item
  11. Patch 1 item
Rail Length
  1. 9.5" 1 item
  2. 10" 7 items
  3. 12" 2 items
  4. 15" 8 items
Size
  1. 9 Slot 9 items
Thread Pitch
  1. 1/2x28 (9mm) 2 items
  2. 1/2x28 (.22 cal) 18 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 7 items
  5. 11/16x24 1 item
Threaded
  1. Yes 4 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 11 items
  3. 1:7.5 1 item
  4. 1:8 9 items
  5. 1:10 10 items
  6. 1:14 1 item
Stock Status
  1. Out of stock 48 items Remove This Item
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