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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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  4. Forward Controls Design PCM Cable Management Panel
    Forward Controls Design PCM Cable Management Panel
    $28.50
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  10. Forward Controls Design End Plate w/ Three QD Ports
    Forward Controls Design End Plate w/ Three QD Ports
    $62.70
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  11. Forward Controls Design RE5F A5 Receiver Extension
    Forward Controls Design RE5F A5 Receiver Extension
    $57.50 - $74.10
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  14. Forward Controls Design EPC Billet 7075 Ejection Port Cover
    Forward Controls Design EPC Billet 7075 Ejection Port Cover
    $47.50
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  16. Forward Controls Design EPC Billet 7075 2 Dimple Ejection Port Cover
    Forward Controls Design EPC Billet 7075 2 Dimple Ejection Port Cover
    $47.50
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Caliber
  1. .223 Wylde 1 item
  2. .30 Cal 2 items
  3. 9mm 2 items
Category
  1. Receiver Parts 3 items
  2. Parts & Kits 37 items
  3. Buffer Systems 3 items
  4. Trigger Parts 2 items
  5. Gas Systems 2 items
  6. Muzzle Devices 22 items
  7. Bolt Parts 4 items
  8. Grips 4 items
  9. Charging Handles 3 items
  10. Rifle Handguards 11 items
  11. Stocks & Braces 1 item
Color
Configuration
  1. 90 Degree 1 item
  2. .750 DIA 1 item
Finish
  1. DLC 3 items
  2. Nitride 2 items
  3. Anodize 1 item
Gas Block Diameter
  1. .625" 1 item
Inside Diameter
  1. 1.315" 1 item
Is Firearms?
  1. No 92 items
Model
  1. Sig MPX 1 item
Mount
  1. M-LOK 7 items
  2. Picatinny 2 items
Option
  1. AR-10 2 items
  2. AR-15 11 items
  3. Non-Adjustable 1 item
  4. Dimpled 4 items
  5. Serrated 5 items
Platform
  1. AR-10 1 item
  2. AR-15 9 items
  3. Sig Sauer 1 item
Price
  1. $0.00 - $99.99 74 items
  2. $100.00 - $199.99 10 items
  3. $200.00 and above 8 items
Product Type
  1. Accessory 3 items
  2. AR-15 Charging Handle 1 item
  3. AR-15 Handguard 3 items
  4. AR-15 Stripped Upper Receiver 3 items
  5. Bolt Carrier Group 3 items
  6. Bolt Catch 9 items
  7. Buffer Tube 2 items
  8. Cam Pin 1 item
  9. Castle Nut 2 items
  10. Cable Clip 1 item
  11. Charging Handle 2 items
  12. Compensator 3 items
  13. Dust Cover 2 items
  14. End Plate 3 items
  15. Flash Hider 11 items
  16. Forearm Accesory 3 items
  17. Forward Assist 4 items
  18. Gas Block 2 items
  19. Handguard 4 items
  20. Handstop 1 item
  21. Magazine Catch 1 item
  22. Magazine Release 6 items
  23. Muzzle Brake 6 items
  24. Muzzle Device Accessory 2 items
  25. Pistol Grip 2 items
  26. Port Door 1 item
  27. Rail Panel 1 item
  28. Retainer Pin 1 item
  29. Safety Selector 6 items
  30. Sling Mount 1 item
  31. Take Down / Pivot Pins 3 items
  32. Trigger Guard 2 items
  33. Vertical Grip 1 item
Rail Length
  1. 6.7" 1 item
  2. 9.5" 4 items
  3. 10.5" 1 item
  4. 11.5" 4 items
  5. 12.8" 1 item
  6. 13.7" 1 item
  7. 15" 1 item
Thread Pitch
  1. 1/2x28 14 items
  2. 1/2x36 1 item
  3. 5/8x24 6 items
Threaded
  1. Yes 11 items
Stock Status
  1. In stock 83 items
  2. Out of stock 9 items
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