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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. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  2. Aero Precision AR-15 M4E1 Stripped Lower Receiver - Sniper Gray Cerakote
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - Sniper Gray Cerakote
    $159.99
    Out of stock
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  3. Surefire SOCOM 5.56 Closed Tine Flash Hider/Adaptor - 1/2x28
    Surefire SOCOM 5.56 Closed Tine Flash Hider/Adaptor - 1/2x28
    $152.00
    Out of stock
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  4. Geissele Super Stabby Bayonet Mount
    Geissele Super Stabby Bayonet Mount
    Out of stock
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  5. Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    Ballistic Advantage Modern Series 5.56 Government Barrel - 12.5"
    $152.00
    Out of stock
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  6. Surefire WARCOMP Closed Tine Flash Hider - 5.56mm Rifles
    Surefire WARCOMP Closed Tine Flash Hider - 5.56mm Rifles
    $152.00
    Out of stock
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  7. Sons Of Liberty Gun Works L9 Receiver Extension Kit
    Sons Of Liberty Gun Works L9 Receiver Extension Kit
    $151.05
    Out of stock
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Barrel Length
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  2. 6" 1 item
  3. 9" 1 item
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  5. 10.5" 2 items
  6. 11.5" 1 item
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  14. Rainier Arms, LLC 4 items
  15. Reptilia Corp 1 item
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  17. Sionics Weapon Systems 1 item
  18. Sons of Liberty Gun Works 1 item
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  2. AR-15 Assembled Upper Receiver 1 item
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  6. AR-15 Stripped Upper Receiver 1 item
  7. Barrel 5 items
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  9. Bolt Carrier Group 6 items
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  11. Buffer Kit 1 item
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  14. Compensator 1 item
  15. Flash Hider 8 items
  16. Forearm Accesory 1 item
  17. Handguard 3 items
  18. Muzzle Brake 2 items
  19. Rail Adapter 1 item
  20. Stock 6 items
  21. Trigger 3 items
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  3. 6.75" 1 item
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  8. 11.5" 1 item
  9. 12" 1 item
  10. 12.5" 1 item
  11. 13" 1 item
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