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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. WMD Guns AR15 Bolt Carrier Group - NiB-X
    WMD Guns AR15 Bolt Carrier Group - NiB-X
    $164.00
    Out of stock
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  5. Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - FDE
    $159.99
    Out of stock
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  6. Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    Aero Precision AR15 Stripped Lower Receiver Gen 2 - FDE
    $139.99
    Out of stock
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  8. Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    Bootleg Adjustable AR-15 Complete Bolt Carrier Group
    $199.95
    Out of stock
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  10. Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    $119.99
    Out of stock
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  13. Hera Arms HUS AR-15 Billet Upper Receivers
    Hera Arms HUS AR-15 Billet Upper Receivers
    $139.00
    Out of stock
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  16. Battle Arms Development Complete Enhanced Lower Parts Kit
    Battle Arms Development Complete Enhanced Lower Parts Kit
    $125.00
    Out of stock
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Items 49-64 of 75

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Barrel Length
  1. 7" 1 item
  2. 18" 3 items
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  2. 5.56 NATO 3 items
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  1. Receiver Parts 31 items
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  1. AR-10 Handguard 1 item
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  6. AR-15 Stripped Upper Receiver 14 items
  7. Bolt 1 item
  8. Bolt Carrier Group 8 items
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  10. Buffer Spring 1 item
  11. Builders Kit 1 item
  12. Charging Handle 1 item
  13. Chassis 1 item
  14. Flash Hider 1 item
  15. Handguard 7 items
  16. Lower Parts Kit 3 items
  17. Silent Captured Spring 1 item
  18. Trigger 1 item
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  1. 4" 1 item
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  29. 15.3" 3 items
  30. 16.3" 1 item
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  1. 5 Slot 1 item
  2. 9 Slot 1 item
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  1. 1/2x28 (.22 cal) 1 item
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  2. Out of stock 39 items
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