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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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  3. Hera Arms LC-S Linear Compensator-Small
    Hera Arms LC-S Linear Compensator-Small
    $69.00
    Out of stock
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  4. Fortis MFG Muzzle Brake 5.56
    Fortis MFG Muzzle Brake 5.56
    Out of stock
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  8. Faxon Firearms GUNNER 5.56 3-Port Muzzle Brake
    Faxon Firearms GUNNER 5.56 3-Port Muzzle Brake
    $55.19
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  11. Nemo Arms 5.56 NATO AR-15 Barrel - 11.5"
    Nemo Arms 5.56 NATO AR-15 Barrel - 11.5"
    $199.00
    Out of stock
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  16. Arms Republic 9mm Complete Upper Assembly - 16"
    Arms Republic 9mm Complete Upper Assembly - 16"
    $460.00
    Out of stock
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  1. Thread Pitch 1/2x28 (.22 cal) Remove This Item
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Barrel Length
  1. 10.3" 1 item
  2. 10.5" 5 items
  3. 11.5" 5 items
  4. 12" 2 items
  5. 12.5" 5 items
  6. 13.7" 2 items
  7. 13.9" 2 items
  8. 14.5" 4 items
  9. 16" 16 items
  10. 16.1" 1 item
  11. 18" 8 items
  12. 20" 4 items
  13. 22" 2 items
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  1. Dissipator 2 items
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  6. 5.56mm 3 items
  7. 7.62mm 1 item
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  1. Receiver Parts 11 items
  2. Barrels 44 items
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  1. AR-15 Barrel 44 items
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  8. Muzzle Brake 18 items
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  2. 9.55" 1 item
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