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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. Rail Length 15" Remove This Item
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Barrel Length
  1. 10.5" 2 items
  2. 11.5" 1 item
  3. 12.5" 2 items
  4. 13.7" 1 item
  5. 14.5" 1 item
  6. 16" 7 items
  7. 16.1" 1 item
Barrel Profile
  1. Non-fluted 2 items
Caliber
  1. .223 Wylde 1 item
  2. 5.56 NATO 7 items
  3. 9mm 1 item
Category
  1. Receiver Parts 8 items
  2. Parts & Kits 1 item
  3. Rifle Handguards 27 items
Color
Configuration
  1. AR-15 3 items
Finish
  1. Cerakote 1 item
  2. Anodize 2 items
Gas Block Diameter
  1. .750" 5 items
Gas System Length
  1. Carbine 1 item
  2. Mid 7 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 3 items
  2. 1.31" 1 item
  3. 1.315" 1 item
  4. 1.385" 1 item
  5. 1.39" 1 item
  6. 1.4" 1 item
  7. 1.54" 1 item
Manufacturer
  1. Aero Precision 2 items
  2. Angstadt Arms 1 item
  3. Bootleg 2 items
  4. Bravo Company MFG (BCM) 1 item
  5. Cross Machine Tool (CMT) 1 item
  6. Fortis MFG 1 item
  7. Forward Controls Design 1 item
  8. Geissele 4 items
  9. Griffin Armament 2 items
  10. HERA ARMS 1 item
  11. Icon Defense 1 item
  12. Lantac 1 item
  13. Next Level Armament 1 item
  14. Noveske 3 items
  15. Primary Weapon Systems 1 item
  16. Rainier Arms, LLC 3 items
  17. Rainier Industries 1 item
  18. ROAM Rifles 2 items
  19. Sharps Bros 2 items
  20. Sons of Liberty Gun Works 3 items
  21. V Seven Weapon Systems 2 items
Mount
  1. M-LOK 22 items
Option
  1. AR-10 1 item
  2. AR-15 17 items
Platform
  1. AR-15 10 items
Price
  1. $0.00 - $999.99 34 items
  2. $1,000.00 and above 2 items
Product Type
  1. AR-10 Handguard 1 item
  2. AR-15 Complete Upper Receiver 4 items
  3. AR-15 Partial Upper Receiver 4 items
  4. AR-15 Handguard 25 items
  5. Handguard 6 items
  6. Parts Kit 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 8 items
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 3 items
  2. 1:10 1 item
Stock Status
  1. In stock 35 items Remove This Item
  2. Out of stock 1 item
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