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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. 8" 1 item
Caliber
  1. 300 Blackout 1 item
  2. 5.56 NATO 2 items
Category
  1. Receiver Parts 27 items
  2. Parts & Kits 4 items
  3. Buffer Systems 5 items
  4. Gas Systems 3 items
  5. Bolt Parts 4 items
  6. Charging Handles 3 items
  7. Rifle Handguards 6 items
Color
Configuration
  1. AR-15 1 item
Finish
  1. Cerakote 4 items
  2. FDE 1 item
  3. Nickel Boron 1 item
  4. Nitride 1 item
  5. Anodize 2 items
Gas Block Diameter
  1. .625" 1 item
  2. .750" 3 items
Gas System Length
  1. Pistol 1 item
Inside Diameter
  1. 1.3" 1 item
Mount
  1. M-LOK 1 item
Option
  1. AR-9 3 items
  2. AR-10 7 items
  3. AR-15 20 items
  4. Small Lever 1 item
  5. Large Lever 2 items
  6. Adjustable 2 items
  7. Non-Adjustable 1 item
Platform
  1. AR-10/LR308 1 item
  2. AR-15 7 items
Product Type
  1. AR-10 / LR 308 Charging Handle 1 item
  2. AR-10 Complete Upper Receiver 1 item
  3. AR-10 Handguard 3 items
  4. AR-10 Receiver Set 1 item
  5. AR-10 Stripped Lower Receiver 2 items
  6. AR-10 Stripped Upper Receiver 1 item
  7. AR-15 Assembled Upper Receiver 1 item
  8. AR-15 Charging Handle 2 items
  9. AR-15 Complete Lower Receiver 4 items
  10. AR-15 Complete Upper Receiver 1 item
  11. AR-15 Handguard 3 items
  12. AR-15 Receiver Set 1 item
  13. AR-15 Stripped Lower Receiver 10 items
  14. AR-15 Stripped Upper Receiver 3 items
  15. AR-9 Lower Receiver 1 item
  16. AR-9 Complete Lower Receiver 1 item
  17. AR-9 Receiver Set 1 item
  18. Bolt Carrier Group 4 items
  19. Buffer Kit 4 items
  20. Buffer Tube 1 item
  21. Gas Block 3 items
  22. Lower Parts Kit 3 items
  23. Upper Parts Kit 1 item
Rail Length
  1. 7" 1 item
  2. 12" 1 item
  3. 15" 6 items
Thread Pitch
  1. 5/8x24 (.30 cal) 1 item
Threaded
  1. Yes 1 item
Twist Rate
  1. 1:7 1 item
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  1. Out of stock 52 items Remove This Item
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