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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. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  2. Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
    Dead Foot Arms AR-15 AR-SD 9MM Upper Assembly
    Out of stock
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  3. Dead Foot Arms AR-15 AR-MP9 9MM Upper Assembly
    Dead Foot Arms AR-15 AR-MP9 9MM Upper Assembly
    Out of stock
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  4. Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    $712.50
    Out of stock
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  5. Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    $807.50
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  6. Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    $404.00
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  7. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    $950.00
    Out of stock
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  8. Angstadt Arms 16″ 9mm Complete Upper Assembly
    Angstadt Arms 16″ 9mm Complete Upper Assembly
    $629.00
    Out of stock
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  9. Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    $530.00
    Out of stock
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  10. Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    Heresy Design AUG Barrel Conversion Kit 300BLK - 16.3"
    $799.95
    Out of stock
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  11. Q LLC Cherry Bomb Muzzle Brake 8.6BLK - 5/8x24
    Q LLC Cherry Bomb Muzzle Brake 8.6BLK - 5/8x24
    $90.00
    Out of stock
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  12. JK Armament War Eagle 7.62mm Comp/Flash Hider - M14x1LH
    JK Armament War Eagle 7.62mm Comp/Flash Hider - M14x1LH
    $125.10
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Items 81-92 of 92

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Barrel Length
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  1. $0.00 - $999.99 85 items
  2. $1,000.00 and above 7 items
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  1. AR-10/LR308 Barrel 1 item
  2. AR-15 Barrel 3 items
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  5. AR-15 Handguard 1 item
  6. AR-9 Upper Receiver 1 item
  7. Barrel 22 items
  8. Compensator 4 items
  9. Complete Upper 4 items
  10. Flash Hider 10 items
  11. Muzzle Brake 17 items
  12. Muzzle Device Accessory 1 item
  13. Parts Kit 5 items
Rail Length
  1. 9.2" 1 item
  2. 9.5" 3 items
  3. 9.55" 3 items
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  5. 11" 2 items
  6. 11.7" 2 items
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  8. 13.7" 1 item
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  1. In stock 64 items
  2. Out of stock 28 items
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